childish

• adj.子供っぽい、幼稚な

子供から、子供へ。

childish (adj.)

Old English cildisc "proper to a child;" see child + -ish. Meaning "puerile, immature, like a child" in a bad sense is from early 15c. Related: Childishly; childishness.

1. She 's just being childish and immature.

彼女は子供っぽい性格をしていて、本当にわがままだ。

2.Don 't be so childish ！

そんなに幼稚になるな！

3.We eventually ran out of patience with his childish behaviour.

私たちはついに彼の幼稚な行為に我慢できなかった。

4.A childish idea like that can be amusedly tolerated.

そんな幼稚な考えは笑ってもいい。

5.You would be laughed out of court with such a childish question.

そんな幼稚な質問をすると、笑われてしまいます。