dumb
英 [dʌm]
美[dʌm]
	    - adj. 哑的,无说话能力的;不说话的,无声音的
 
英英释意
- 1. slow to learn or understand; lacking intellectual acuity;
 - "so dense he never understands anything I say to him"
 - "never met anyone quite so dim"
 - "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray
 - "dumb officials make some really dumb decisions"
 - "he was either normally stupid or being deliberately obtuse"
 - "worked with the slow students"
 
- 2. unable to speak temporarily;
 - "struck dumb"
 - "speechless with shock"
 
- 3. lacking the power of human speech;
 - "dumb animals"
 
- 4. unable to speak because of hereditary deafness