| dumb | (adjective) slow to learn or understand; lacking intellectual acuity | Synonyms: dense, dim, dull, obtuse, slow |
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| (adjective) unable to speak because of hereditary deafness | Synonyms: mute, silent |
| (adjective) temporarily incapable of speaking | Synonyms: speechless |
| (adjective) lacking the power of human speech | - |
| dumbass | (noun) a stupid person; these words are used to express a low opinion of someone's intelligence | Synonyms: blockhead, bonehead, dunce, dunderhead, fuckhead, hammerhead, knucklehead, loggerhead, lunkhead, muttonhead, numskull, shithead |
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| dumbbell | (noun) an exercising weight; two spheres connected by a short bar that serves as a handle | - |
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| (noun) an ignorant or foolish person | Synonyms: boob, booby, dope, dummy, pinhead |
| dumbfound | (verb) be a mystery or bewildering to | Synonyms: amaze, baffle, beat, bewilder, flummox, get, gravel, mystify, nonplus, perplex, pose, puzzle, stick, stupefy, vex |
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| dumbfounded | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbstricken, dumbstruck, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumbfounding | (adjective) bewildering or striking dumb with wonder | Synonyms: astounding, dumfounding |
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| dumbly | (adverb) mutely | - |
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| (adverb) stupidly or insensitively | Synonyms: densely, obtusely |
| dumbness | (noun) the quality of being mentally slow and limited | Synonyms: denseness, slow-wittedness |
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| dumbstricken | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstruck, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumbstruck | (adjective) as if struck dumb with astonishment and surprise | Synonyms: dumbfounded, dumbstricken, dumfounded, flabbergasted, stupefied, thunderstruck |
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| dumbwaiter | (noun) a small elevator used to convey food (or other goods) from one floor of a building to another | Synonyms: food elevator |
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