がきにしては、随分大人びたことを言ったな。の英語

For a brat, you've said something very mature.

You should know better now you're an adult.

You should know better now that you're an adult.

The child talks as if he were a man.

of an adult, being childish and disgraceful

You have grown beyond recognition.

You shouldn't do childish things.

I think you shouldn't do childish things.

I wish you wouldn't do childish things.

I really don't want you to do childish things.

The word refers to not only adult but also children.

The word refers to not only adults but also children.

That child talks as if he were an adult.

I didn't expect to become this sort of adult...

You are quite grown up.

Don't grow up. It's a trap!

His fortune has grown larger in his hands.

Have you already become an adult?

Did you already grow up?

He makes a fool of adults.

You should act like an adult

I'll tell you when you're older.

consenting adults

Now you are a big boy, behave yourself.

Don't grow up to be like me.

Don't grow up. It's a trap!

You are quite a man.

He has moderate views.

You've shot up, haven't you, Dick?

That boy talks as if he were a grown up.