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dumb

adjective (SILENT)
 
 
/dʌm/

Definition

C1 permanently or temporarily unable to speak: He's been deaf and dumb since birth. She was struck dumb by what she had seen.Handicap and the disabled dumbness
 
 
/ˈdʌm.nəs/ noun [U]
Handicap and the disabled
(Definition of dumb adjective (SILENT) from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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