Adjective
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unable to speak because of hereditary deafness
-
lacking the power of human speech
"dumb animals"
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temporarily incapable of speaking
"struck dumb"
"speechless with shock"
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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"