Definition: Childish behavior is silly, like that of a small child. Level: B2
别撅嘴了；因为不能随心所欲就这样，真是幼稚的反应。
Stop pouting; it's such a ___childish reaction to not getting your way.
他在工作中不断寻求关注，这被认为相当幼稚。
His constant need for attention at work is seen as rather ___childish.
为谁能坐靠窗的座位而争吵，对成年人来说有点幼稚。
Arguing over who gets the window seat is a bit ___childish for adults.
