American English

Definition of dumb adjective from the Oxford Advanced American Dictionary

     

    dumb

     adjective
    adjective
    NAmE//dʌm//
     
    (dumber, dumbest)
     
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  1. 1(informal) stupid That was a pretty dumb thing to do. If the police question you,act dumb (= pretend you do not know anything). In her early movies she played a dumb blonde.
  2. 2temporarily not speaking or refusing to speak We were all struck dumb with amazement. We sat there in dumb silence.
  3. 3unable to speak She was born deaf and dumb. Dumb used in this meaning is old-fashioned and can be offensive. It is better to use speech-impaired instead.
  4.  
    adverb “Are you all right?” Laura nodded dumbly.
  5.  
    noun [uncountable]
See the Oxford Advanced Learner's Dictionary entry: dumb