1. (adj) dense, dim, dull, dumb, obtuse, slow
slow to learn or understand; lacking intellectual acuity
Synonyms: vague, ho-hum, muted, sluggish, subdued, deadening, faint, mute, slow, thudding, boring, dumb, dense, irksome, black, silent, wispy, heavy, dim, purblind, muffled, tedious, impenetrable, dull, dimmed, speechless, shadowy, tiresome, softened, bleak, thick, wearisome, obtuse, leaden
Antonyms: smart, articulate
2. (adj) speechless, dumb
temporarily incapable of speaking
Synonyms: mute, dull, obtuse, silent, dense, dim, speechless, dumb, slow
Antonyms: articulate, smart
3. (adj) dumb
lacking the power of human speech
Synonyms: mute, dull, obtuse, silent, dense, dim, speechless, slow
Antonyms: articulate, smart
4. (adj) dumb, mute, silent
unable to speak because of hereditary deafness
Synonyms: unspoken, understood, dull, dim, tacit, mute, dense, tongueless, unsounded, soundless, speechless, still, dumb, slow, silent, mum, obtuse, wordless
Antonyms: smart, articulate
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Synonyms and Antonyms of DUMB 
