puerile
词根词缀：
puerile adj. 孩子气的，幼稚的
puer 幼稚的，孩子气的 + ile 属于…的 → 孩子气的，幼稚的
puerility n. 幼稚，孩子气
pueril 孩子气的，幼稚的 + ity 具备某种性质，状况 → 幼稚，孩子气
数据来源：新东方英语词汇速记大全
相关例句：
Your euphemisms are so puerile.
你的委婉说法很幼稚。
But they have often laughed at our puerile and universal ( prevalent) fear.
然而他们对我们幼稚的，普遍的恐惧感到好笑。
Americans rarely discuss this topic; after all, rest room habits seem a tad puerile.
美国人很少讨论这个话题；毕竟，谈论如厕习惯似乎是一种幼稚的行为。
His newspapers mounted a puerile campaign against him.
他的报纸发动了一场反对他的愚蠢而幼稚的运动。
Our country to taxpayer right legal theory study compared to other countries started quite late, in its theoretical aspects of research or compare puerile.
我国对纳税人知情权法律制度理论的研究相比较其他国家而言起步较晚，在其理论方面的研究还是比较稚嫩。
They are called fathers and mothers by the civil code, which is puerile and honest.
在幼稚而诚实的民法里，那叫做父亲和母亲。