32+ Other Ways to Say Grow Up (100+ Examples)

Many people struggle to find the right words, especially when they need to tell someone to act their age. You might feel stuck, or maybe you just want to sound a bit kinder, but still firm. Finding the perfect synonym for this situation is not always easy. Here, you will find other ways to say grow up, so you can pick the best choice for any moment.

Mature Ways to Say Grow Up

Act Your Age

Sometimes you need a classic, firm reminder for someone who is being silly, especially when they should know better. This phrase is a common synonym that works well with friends, or even colleagues, who are acting quite childish. It tells the person to calm down, and start behaving in a way that matches their actual age, instead of acting like a toddler in a store.

• Please try to act your age, because we have important work to finish.
• He needs to act your age, before he loses his job for good.
• You should really act your age, if you want people to take you seriously.
• If she could just act your age, things would be much easier for everyone.

Take Responsibility

Life is full of moments where you must step up, and own your own choices. This is another word for taking charge of your life, instead of blaming others for your mistakes. It sounds serious, and it carries a lot of weight, so use it when someone is dodging their duty. It shows you care about their future, and want them to be better.

• You need to take responsibility, if you want to fix this messy situation.
• He will take responsibility, once he realizes his actions have real consequences.
• It is time to take responsibility, so stop pointing fingers at your friends.
• She learned to take responsibility, and now she handles problems like a pro.

Show More Maturity

When you want to be gentle, this phrase helps you guide someone toward better choices. It acts as a polite nudge, suggesting that they have the ability to be wiser, if they only tried. It works best with younger people, or friends who are going through a rough patch, and just need a little boost of confidence to handle things with more grace.

• You should show more maturity, when you talk to the manager about your pay.
• He needs to show more maturity, if he wants to lead the team next year.
• Please show more maturity, because your behavior is hurting the whole group today.
• They will show more maturity, as soon as they get a bit more practice.

Become an Adult

This phrase sounds a bit blunt, but it is clear and honest when someone is acting helpless. It works well when you feel someone depends on others too much, or refuses to handle simple tasks. It is not mean, but it is direct, and it forces the person to think about what it means to be a real, functioning, and independent person.

• It is time for you to become an adult, and move out of your parents house.
• He must become an adult, if he wants to handle his own bills and rent.
• You need to become an adult, so you can finally make your own decisions now.
• She will become an adult, once she starts taking care of her own chores.

Stop Acting Childish

When someone is throwing a fit, or being stubborn for no reason, this phrase sets a clear boundary. It points out that their behavior is not helping, and it is honestly getting a bit tiring to watch. Use this when you are frustrated, and you want the other person to understand that their current way of doing things is just not working out.

• You need to stop acting childish, because this meeting is for serious adults only.
• He needs to stop acting childish, so we can finally reach a good agreement.
• Please stop acting childish, or we will have to end this talk right now.
• If she would stop acting childish, everyone would be much happier in this office.

Use Better Judgment

Choosing the right path is a big part of life, and this phrase reminds someone to think before they act. It sounds wise, and it gives the person a chance to fix their mistake without feeling attacked. It is perfect for a teacher, a mentor, or a parent who wants to help someone learn from a silly error, instead of just feeling bad.

• You must use better judgment, if you want to avoid these silly mistakes later.
• He will use better judgment, once he understands the risks of his recent choice.
• Please use better judgment, because your plan might cause a lot of trouble today.
• They need to use better judgment, so they can keep their reputation in check.

Develop a Thicker Skin

Some people react too strongly to small problems, and this phrase helps them build strength. It suggests that they should not let every little thing bother them, or ruin their day. It is a kind way to say that they need to stop overreacting, and start facing life with a bit more calm, and steady, nerves under pressure.

• You need to develop a thicker skin, if you want to survive this tough job.
• He should develop a thicker skin, so he does not cry every time he fails.
• Please develop a thicker skin, and try to ignore what the mean people say.
• She will develop a thicker skin, as she meets more people in the real world.

Be More Sensible

Common sense is a great skill, and this phrase highlights its importance when someone is being reckless. It is a soft way to say that their current idea is not very smart, and they should rethink it. It sounds caring, and it invites the person to slow down, look at the facts, and make a decision that actually makes some sense.

• You need to be more sensible, before you spend all your money on that trip.
• He should be more sensible, if he wants to stay safe during the storm today.
• Please be more sensible, because that idea is going to end in total disaster.
• They will be more sensible, once they see how the project turns out later.

Grow Up a Bit

This is short, sweet, and to the point when you need to be brief. It is the most direct way to say the topic, but it keeps things light if you use a friendly tone. Use this when a friend is joking around too much, or not taking a situation as seriously as they really should be doing right now.

• You really need to grow up a bit, if you want to keep this job.
• He should grow up a bit, and start listening to what his boss says.
• Please grow up a bit, because we are all tired of your silly jokes.
• They need to grow up a bit, so they can handle the tasks we give.

Show Some Sense

When someone is acting like they have no idea what is going on, this phrase wakes them up. It suggests that they are capable of being smart, but they are choosing not to be. It is a slightly witty way to call them out, while still pushing them toward the right, and more logical, path for their own good.

• You should show some sense, and leave before the party gets way too loud.
• He needs to show some sense, so he does not waste all his time today.
• Please show some sense, if you want to impress the new group of friends.
• They will show some sense, once they realize how much work is left to do.

Direct Ways to Say Grow Up

Start Acting Your Age

When you are really tired of someone being silly, this phrase hits home. It is a clear instruction that they are currently failing to match their behavior to their years. You might use this when someone is making a scene, or acting out in a way that is just plain embarrassing for everyone who is watching them right now.

• You need to start acting your age, because that behavior is just plain rude.
• He should start acting your age, if he wants us to respect his own ideas.
• Please start acting your age, so we can finally finish this simple project today.
• If she would start acting your age, she would have many more friends here.

Behave Yourself

This sounds like something a parent says, but it works in many professional settings too. It is a firm command that means you need to get your act together, and stop causing trouble. It is very useful when someone is being loud, or disruptive, and you need them to quiet down immediately, so you can get back to work.

• You need to behave yourself, if you want to stay in this nice place.
• He must behave yourself, so the meeting can go on without any more stops.
• Please behave yourself, because we are in a quiet zone for the library visit.
• They should behave yourself, if they want to earn a reward at the end.

Stop the Nonsense

When you are done with excuses, this phrase clears the air. It tells the person that you see what they are doing, and you are not interested in it anymore. It is great for when someone is making silly excuses, or trying to trick you, and you want to bring the focus back to the real point at hand.

• You need to stop the nonsense, and tell me the honest truth right now.
• He should stop the nonsense, if he wants to solve this problem for good.
• Please stop the nonsense, because nobody is buying those silly excuses today, friend.
• They will stop the nonsense, as soon as they realize that we know everything.

Get Serious

This is a quick way to change the mood of a conversation instantly. It lets the other person know that the fun time is over, and it is time to work. It is very effective for stopping a long, rambling talk, or when someone is being too goofy during a moment that needs your full attention.

• You need to get serious, if you want to pass this big test tomorrow.
• He should get serious, so he does not fail his final project at school.
• Please get serious, because this is a big deal for the whole company today.
• They will get serious, once they see how much money is on the line.

Stop Being Silly

When someone is making jokes at the wrong time, this phrase puts an end to it. It is gentle enough to not sound mean, but firm enough to get the point across. It tells the person that while you like a joke, this specific moment is not the time for being funny, or acting in a goofy way.

• You need to stop being silly, and pay attention to what the teacher says.
• He should stop being silly, so we can finish packing these boxes before dark.
• Please stop being silly, because this is a very heavy topic for us all.
• If she would stop being silly, we would get home much faster than this.

Show Some Backbone

If someone is being weak, or afraid to stand up for themselves, this phrase encourages them to be brave. It suggests that they should find their courage, and handle the hard stuff with a stronger heart. It is a great way to push someone forward, when they are scared of a challenge that they really need to face today.

• You need to show some backbone, and tell your boss what you really think.
• He should show some backbone, so he does not let others walk all over.
• Please show some backbone, because you have the power to fix this thing now.
• They will show some sense and show some backbone, when the time is right.

Put Away the Games

This is a great phrase for someone who avoids duty by playing around. It tells them that the time for play is done, and the time for work is here. It is a bit stern, but it is necessary when you are dealing with someone who is constantly putting off their chores to do something fun instead.

• You need to put away the games, and start cleaning your messy room today.
• He should put away the games, because his homework is not going to finish.
• Please put away the games, so we can finally talk about the big plans.
• They will put away the games, as soon as they get a real job.

Act Like a Pro

When you are in a work setting, this is the best way to say that someone is not meeting the bar. It tells them that their current level of skill or conduct is not good enough for the job. It is a direct challenge that asks them to rise up, and do better than they have been doing lately.

• You need to act like a pro, if you want to win this big contract.
• He should act like a pro, and stop complaining about his small, daily tasks.
• Please act like a pro, because we are representing our team to the public.
• They will act like a pro, once they learn how to handle the pressure.

Casual Ways to Say Grow Up

Get a Grip

This is a very common phrase to use when someone is losing their cool, or making a huge deal out of nothing. It means you need to calm down, and look at the situation with clear eyes. It is best used with friends who know you well, as it can sound a little bit harsh to someone you do not know.

• You need to get a grip, because it is just a tiny, small mistake.
• He should get a grip, so he stops shouting at everyone for no reason.
• Please get a grip, and realize that things will get better in a while.
• They need to get a grip, before they lose all their friends by acting.

Stop Playing Around

When someone is wasting time on trivial things, this is the perfect, simple phrase to use. It tells them to drop the fun, and focus on what needs to be done. It is very easy to say, and it works in almost any casual situation where people are being lazy, or just not paying attention to their tasks.

• You need to stop playing around, and start helping me with the dishes here.
• He should stop playing around, if he wants to finish his work by five.
• Please stop playing around, because we have a lot of stuff to move today.
• They will stop playing around, once they see how much there is to do.

Wake Up

This is a sharp, two-word punch that tells someone they are living in a dream world. It suggests that they are not seeing the truth, or that they are being naive about something important. It is quite strong, so use it carefully when you really want to shake someone out of their current, and silly, mood today.

• You need to wake up, because that plan is not going to work at all.
• He should wake up, and see that his friends are using him for money.
• Please wake up, and realize that you are the only one who can help.
• They will wake up, once they lose everything that they have worked for now.

Don’t Be a Baby

This is a bit meaner, so be careful who you say it to, but it is effective. It tells someone that their complaints are not valid, and they are being too sensitive about a small issue. It is a common, and very informal, way to tell someone that they need to toughen up, and stop looking for sympathy now.

• You need to not be a baby, and just take your medicine like a man.
• He should not be a baby, and just admit that he was completely wrong.
• Please don’t be a baby, because the movie was not even that scary, really.
• They will not be a baby, once they learn how to face the world.

Get Real

When someone has a crazy idea, this phrase brings them back to earth. It suggests that they are being unrealistic, and they need to look at the facts before they go any further. It is a quick, and very popular, way to tell someone that their expectations are way too high for the current situation, friend.

• You need to get real, because that car costs more than you make now.
• He should get real, if he thinks he can win without any hard practice.
• Please get real, and look at the actual facts before you decide to go.
• They will get real, as soon as they see the bill for the dinner.

Grow a Pair

This is very informal, and can be seen as rude, so only use it with your closest pals. It essentially means you need to find some courage, and stop being so afraid of everything. It is a very blunt way of saying that someone needs to be brave, and stop hiding from their own problems today.

• You need to grow a pair, and tell her how you really feel about.
• He should grow a pair, and go ask the boss for the raise finally.
• Please grow a pair, and stop worrying about what other people might say now.
• They will grow a pair, once they are forced to deal with their life.

Stop the Act

If you think someone is faking their behavior, this phrase calls them out. It tells them that you know what they are doing, and you want them to stop pretending. It is great for when someone is trying to be cool, or tough, when they are clearly not, and it really is just an act.

• You need to stop the act, because we all know you are scared inside.
• He should stop the act, and just be his own self for once today.
• Please stop the act, as it is making everyone feel quite uneasy around you.
• They will stop the act, once they feel safe enough to be honest here.

Professional Ways to Say Grow Up

Display Professional Conduct

In a work meeting, this is the most polite, and effective, way to ask for better behavior. It sounds classy, and it does not insult the person directly. Instead, it asks them to remember that they are at work, and they have a duty to act in a way that helps the company look good to clients.

• You need to display professional conduct, if you want to keep this nice job.
• He should display professional conduct, so we can work together as a team now.
• Please display professional conduct, because our clients are watching us very closely today, friend.
• They will display professional conduct, as soon as they understand the company rules well.

Demonstrate Maturity

This is a soft, but very clear, way to tell someone they need to step up their game. It suggests that they have the potential to be better, and they should show it. It is great for feedback, or when you are talking to a new employee who is still learning how to handle the office stress.

• You need to demonstrate maturity, when you deal with these angry customers on phone.
• He should demonstrate maturity, so he can earn the trust of the main boss.
• Please demonstrate maturity, because your latest email was not very polite to read.
• They will demonstrate maturity, as they gain more skills in this new role today.

Exhibit Greater Responsibility

This phrase is perfect for when someone is being careless, or missing their deadlines. It tells them that they need to take their work seriously, and own their results. It sounds formal, and it carries the weight of a serious request, which is often what you need when dealing with someone who is lagging.

• You need to exhibit greater responsibility, if you want to lead this project team.
• He should exhibit greater responsibility, so he does not miss any more big goals.
• Please exhibit greater responsibility, because we are counting on you to do your part.
• They will exhibit greater responsibility, once they see how the team relies on them.

Maintain Decorum

This is a very formal way to say stop being loud, or rude, in a public or group setting. It is often used in meetings, or at formal events, to remind people that they need to act with respect and manners. It is very effective at cooling down a heated room, or calming someone who is being too rowdy.

• You need to maintain decorum, because this is a formal space for all guests.
• He should maintain decorum, so we do not bother the other people in room.
• Please maintain decorum, as the meeting is being recorded for the whole main office.
• They will maintain decorum, once they see how everyone else is behaving right now.

Practice Sound Judgment

This suggests that the person is making rash, or silly, choices. It is a polite way to tell them to slow down, and think about the best way to handle a problem. It sounds respectful, and it gives the person a chance to correct their course without feeling like they are being scolded by their peers.

• You need to practice sound judgment, when you choose the vendors for our event.
• He should practice sound judgment, so he does not waste the budget on items.
• Please practice sound judgment, and consult with the team before making a final choice.
• They will practice sound judgment, as they get more experience with these hard cases.

Behave in a Measured Manner

This is a fancy way to say do not overreact, and keep your calm. It tells someone that their emotions are running too high, and they need to tone it down. It is a very calm, and professional, way to handle a tense situation without making it feel like a big, dramatic fight at all.

• You need to behave in a measured manner, when you speak to the angry board.
• He should behave in a measured manner, so he does not seem weak to them.
• Please behave in a measured manner, because we need to stay cool and very calm.
• They will behave in a measured manner, once they see how we handle the pressure.

Cultural Ways to Say Grow Up

Act Like a Big Person

In some cultures, this is a very common way to tell children to stop being little. It is simple, and it works well when you want to appeal to their pride. By calling them a big person, you are giving them a compliment, while also asking them to behave in a better way, and stop the baby talk now.

• You need to act like a big person, and eat all of your green vegetables.
• He should act like a big person, and stop crying about the small, torn toy.
• Please act like a big person, so we can go to the fun park today.
• They will act like a big person, as they grow and learn new things daily.

Grow Into Your Skin

This is a poetic way to say that someone is still learning, and they need time to become who they are. It suggests that growing up is a journey, and they should be patient with themselves. It is a very kind, and thoughtful, way to tell someone that they are doing fine, but need to be more steady.

• You need to grow into your skin, and learn to love who you are today.
• He should grow into your skin, and stop trying to be someone he is not.
• Please grow into your skin, because you are doing a great job at the life.
• They will grow into your skin, as they discover all the things they can do.

Stand on Your Own Two Feet

When someone relies too much on their family, or friends, this is the best way to encourage them to be independent. It tells them that they need to support themselves, and start making their own way in the world. It is a very strong, and empowering, message for anyone who is starting their adult life.

• You need to stand on your own two feet, and get a real job now.
• He should stand on your own two feet, instead of asking for money again today.
• Please stand on your own two feet, and show the world what you can do.
• They will stand on your own two feet, once they move out on their own.

Take the Bull by the Horns

This is an idiom, or a saying, that means you should face your problems directly. It is a very active way to tell someone to stop avoiding what is hard, and start doing it. It is great for when someone is being passive, or lazy, about a task that they know they have to finish eventually.

• You need to take the bull by the horns, and finish your thesis this week.
• He should take the bull by the horns, and fix the leak in the roof.
• Please take the bull by the horns, and start the project that we discussed now.
• They will take the bull by the horns, once they realize that nobody else will.

Find Your Way

This is a gentle, and supportive, way to tell someone that they need to start figuring out their own path. It acknowledges that it is hard to grow up, but it also pushes them to start trying. It is a very loving way to say that you believe in them, and you know they can succeed.

• You need to find your way, and start looking for what you love to do.
• He should find your way, instead of following what all his friends are doing now.
• Please find your way, because you have a bright future ahead of you to reach.
• They will find your way, as they explore the world and see what fits them.

Come Into Your Own

When you see someone finally starting to act like a confident person, this is the perfect thing to say. It means they are starting to show their true self, and they are finally acting with the maturity you knew they had. It is a very proud, and warm, compliment to give to someone you care about deeply.

• You need to come into your own, and stop hiding your talents from the world.
• He should come into your own, and show the boss how smart he really is.
• Please come into your own, because you are so much better than you think here.
• They will come into your own, once they stop listening to the mean, loud critics.

Tips for Picking the Right Phrase

Choosing the right way to say something requires you to think about who you are talking to, and where you are. A friend needs a different tone than a boss, so always take a quick second to pause before you speak, so you can pick the best words for the moment.

Consider the Audience

Think about who is listening to your words. A friend might find a joke funny, but a boss might be offended by it. Always adjust your language to match the setting, and the relationship you have with the person you are talking to today.

Assess the Setting

Is this a formal or casual place? Use plain, simple words in a meeting, but feel free to be more colorful when you are at a party. The setting tells you how much you can push, or how much you should pull back, in your talk.

Think About Your Goal

What are you trying to change? Are you trying to teach someone, or are you just frustrated? Knowing your own reason for speaking will help you choose between a kind suggestion, or a very firm command, that gets the job done well.

Keep It Simple

Simple words are often the strongest ones you can use. You do not need big, fancy words to get your point across, so avoid making things complex. A short, honest sentence is usually much better than a long, confusing one that nobody really understands.

Watch Your Tone

Your voice matters just as much as your words. Keep your tone calm, and steady, even when you are annoyed. Being loud, or aggressive, will just make the other person close off, while being calm helps them actually listen to what you have to say.

Always remember that how to say something is just as important as what you say to someone in any tough, or awkward, moment.

Summary of Alternate Ways

Final Thoughts

I hope this list helps you find other ways to say grow up, so you can speak clearly to anyone. Remember that another word for this is often just a kind way to show you care. Pick the phrase that fits your style, and keep your talks easy, honest, and helpful for everyone involved in them.