stupid, dull, dense, crass, dumb mean lacking in power to absorb ideas or impressions. stupid implies a slow-witted or dazed state of mind that may be either congenital or temporary.

Don’t say anything – just act / play dumb (= pretend to be stupid or not to know something).

Definition of dumb adjective in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

Adjective dumb (comparative dumber, superlative dumbest) (dated) Unable to speak; lacking power of speech. Synonyms: mute, speechless, wordless deaf, dumb, and blind (set phrase) His younger brother was born dumb, and communicated with sign language.

Dumb is the Old English word that means "mute, speechless," and itself came from an even older word dheubh meaning "confusion, stupefaction, dizziness." Today, dumb still means "unable to speak," but it doesn't have anything to do with intelligence.

If someone is dumb on a particular occasion, they cannot speak because they are angry, shocked, or surprised.

dumb (dʌm) adj. -er, -est, v. usage: dumb in the sense “lacking the power of speech” is offensive when applied to humans (but not animals), probably because the word also means “stupid; dull-witted.”

DUMB definition: lacking intelligence or good judgment; stupid; dull-witted. See examples of dumb used in a sentence.

Destitute of the power of speech; unable to utter articulate sounds: as, a deaf and dumb person; the dumb brutes. Mute; not accompanied with or emitting speech or sound: as, a dumb show; dumb signs.