Dumb meaning: Definition of dumb adjective

Definition of dumb adjective in Oxford Advanced Learner's Dictionary. Meaning , pronunciation, picture, example sentences, grammar, usage notes, synonyms and more. Learn the informal and old-fashioned meanings of dumb as an adjective and a verb, and how to use it in different contexts. Find out the difference between dumb and mute, and the origin of the phrase to dumb down. Dumb definition: lacking intelligence or good judgment; stupid ; dull-witted.. See examples of DUMB used in a sentence. 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.