心里幼稚用英文怎么说

"Childish" or "immature" can be used to describe a person who acts in a naive or unsophisticated manner.

For example:

"Don't be childish and throw a tantrum just because you didn't get your way."

中文翻译：不要因为不能如愿而发脾气，显得幼稚。

"I can tell from the way he talks that he has a very immature attitude."

中文翻译：从他说话的方式可以看出，他的态度非常不成熟。