s. lacking the power of human speech
s. unable to speak because of hereditary deafness
a. 哑的, 不说话的, 无声音的
[医] 哑的
1. He felt dumb for forgetting his friend's birthday.
他因为忘记朋友的生日而感到愚蠢。
2. It's not dumb to ask questions if you don't understand.
如果你不理解，问问题并不是愚蠢的。
3. She made a dumb mistake on the test.
她在考试中犯了一个愚蠢的错误。