- lacking intelligence or good judgment; stupid; dull-witted.
- lacking the power of speech (offensive when applied to humans): a dumb animal.
- temporarily unable to speak: dumb with astonishment.
- refraining from any or much speech; silent.
- made, done, etc., without speech.
- lacking some usual property, characteristic, etc.
- performed in pantomime; mimed.
- pertaining to the inability to do processing locally: A dumb terminal can input, output, and display data, but cannot process it.
- Nautical.
- (of a barge) without means of propulsion.
- (of any craft) without means of propulsion, steering, or signaling.
- to make or become less intellectual, simpler, or less sophisticated: to dumb down a textbook; American movies have dumbed down.
- lacking the power to speak, either because of defects in the vocal organs or because of hereditary deafness
- lacking the power of human speech
- temporarily lacking or bereft of the power to speak
- refraining from speech; uncommunicative
- producing no sound; silent
- made, done, or performed without speech
- informal
- slow to understand; dim-witted
- foolish; stupid
- (of a projectile or bomb) not guided to its target
