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English definition of “dumb”

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dumb

adjective uk   /dʌm/ us  

dumb adjective (SILENT)

C1 permanently or temporarily unable to speak: He's been deaf and dumb since birth. She was struck dumb by what she had seen.

dumb adjective (STUPID)

B2 mainly US informal stupid : Are they brave or just dumb? What a dumb idea!
dumbness
noun [U] uk   /ˈdʌm.nəs/ us  
(Definition of dumb from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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