1. 幼稚的；孩子气的；愚蠢的
If you describe someone or something as puerile, you mean that they are silly and childish.

1. displaying or suggesting a lack of maturity

e.g. adolescent insecurity
jejune responses to our problems
their behavior was juvenile
puerile jokes

Synonym: adolescentjejunejuvenile

2. of or characteristic of a child

e.g. puerile breathing