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Adjective dumb has 4 senses
dense, dim, dull, dumb, obtuse, slow - 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"Antonym:  smart (indirect, via stupid)
 
speechless, dumb - unable to speak temporarily; "struck dumb"; "speechless with shock"Antonym:  articulate (indirect, via inarticulate)
 
dumb - lacking the power of human speech; "dumb animals"Antonym:  articulate (indirect, via inarticulate)
 
dumb, mute, silent - unable to speak because of hereditary deafnessAntonym:  articulate (indirect, via inarticulate)
 
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