dumb

It was a dumb mistake to leave my car windows open while it was raining.

(Chinese) 下雨时开着车窗真是一个愚蠢的错误。

Don't feel dumb for asking a question; that is how people learn new things.

(Chinese) 不要因为提问而觉得愚蠢；那是人们学习新事物的方式。

The witness was struck dumb with shock after seeing the terrible accident.

(Chinese) 目击者看到那场可怕的事故后，因震惊而变得说不出话来。

Older books often use the phrase "deaf and dumb" to describe people who cannot hear or speak.

(Chinese) 旧书中常使用“聋哑”这个词来描述听不到或不能说话的人。