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. 3 unable 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