1 unable to speak because of hereditary deafness 2 lacking the power of human speech; "dumb animals" 3 temporarily incapable of speaking; "struck dumb"; "speechless with shock" 4 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"
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