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He wasn't enjoying the occasion so he thought he'd spoil it for everyone else - it was very childish of him.

childish behaviour

Marcin is childish

Such a childish plan is bound to fail.

When I became a man I put away childish things, including the fear of childishness and the desire to be very grown up.

He was so childish that he couldn't resist temptation.

Age does not make us childish, as they say. It only finds us true children still.

Women are directly adapted to act as the nurses and educators of our early childhood, for the simple reason that they themselves are childish, foolish, and short-sighted.

Peter was fed up with childish girls.

When an average person sends a message in a bottle, it's just a childish fantasy. When Christopher Columbus sends a message in a bottle, the fate of an entire country is at stake.

When I was a kid, I thought that if I died the world would just disappear. What a childish delusion! I just couldn't accept that the world could continue to exist without me.

They are a very childish sort of people, I think.

Embarassed at having been caught telling such a childish fib (...).

It isn't mature for a grown-up to act irresponsibly. It is childish.

My father can be terribly childish, but he means well.

It's just a child.

Chimpanzees normally have their first child at age 13, humans at age 19.

How do you console a woman who has just lost her only child?

I've heard of pseudomyopia, but I never thought my own child would come to have it.

It is an act of cruelty to lock a small child in his room.

Do you have any siblings? "No, I'm an only child."

Unless you started learning English as a child, you're unlikely to ever sound like a native speaker.

As a new father, I gave my first child plenty of books.

A child develops rapidly between the ages of 13 and 16.

Do you want to get married first or have a child first?

As a child, I liked baseball better than football.

A child whose parents are dead is called an orphan.

Our child seems to be brilliant. Of course, we may be prejudiced.

As soon as the child saw his mother, he stopped crying.

Is it more fun being a child or an adult?

What an infantile idea! / I think you're just infantile.

Left-wing communism is an infantile disorder.