puerility
n. 幼稚,愚蠢; 幼稚、愚蠢的行为、想法等
1. the state of a child between infancy and adolescence
2. a property characteristic of a child
There was always, in her conversation, the same odd mixture of audacity and puerility.
她的谈吐非常奇特,总是那么既大胆放肆同时又天真无邪.
stupidityyouthadolescence