1. (adj) 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"
2. (adj) speechless, dumb
temporarily incapable of speaking
"struck dumb"; "speechless with shock"
3. (adj) dumb
lacking the power of human speech
"dumb animals"
4. (adj) dumb, mute, silent
unable to speak because of hereditary deafness
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Definition of 'DUMB' 
