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. DUMB definition: lacking intelligence or good judgment; stupid; dull-witted.

Understanding the Context

See examples of dumb used in a sentence. Don’t say anything – just act / play dumb (= pretend to be stupid or not to know something). 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.

Key Insights

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, mute, speechless, voiceless describe a condition in which speech is absent. Dumb was formerly used to refer to persons unable to speak; it is now used almost entirely of the inability of animals to speak: dumb beasts of the field.