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src: wikipedia
- Definition
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- dumb :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|dumb officials make some really dumb decisions|he was either normally stupid or being deliberately obtuse|worked with the slow students
- dumb :temporarily incapable of speaking
- struck dumb|speechless with shock
- dumb :lacking the power of human speech
- dumb :unable to speak because of hereditary deafness