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.
权威例句
1. She's just being childish and immature.
她在耍小孩子脾气,真是任性。
2. Don't be so childish!
别那么幼稚!
3. We eventually ran out of patience with his childish behaviour.
我们终于对他幼稚的行为忍无可忍.
4. A childish idea like that can be amusedly tolerated.
像那样幼稚的想法可以一笑置之.
5. You would be laughed out of court with such a childish question.