adj.青春期的；孩子气的；未成熟的

He was trying to give puerile excuses. 他给出的借口总是愚蠢至极。

She was tired of answering these puerile questions. 她回答这些幼稚的问题觉得不胜其烦.

John made mincemeat of all her arguments, and said that he had never heard anything so puerile before. 约翰把她的论点驳得体无完肤，并说他从来没有听过这样幼稚可笑的道理。