Definitions from Wiktionary (dumb)

▸ adjective:  (dated) Unable to speak; lacking power of speech (kept in "deaf, dumb, and blind").
▸ adjective:  (archaic) Not talkative; taciturn or unwilling to speak.
▸ adjective:  (dated) Having no input or voice in running things.
▸ adjective:  (dated, of things, actions, etc.) Unaccompanied by words or speech, silent, wordless.
▸ adjective:  (dated) Not producing any sound, silent.
▸ adjective:  (informal, derogatory, especially of a person) Stupid.
▸ adjective:  (figuratively) Pointless, foolish, lacking intellectual content or value.
▸ adjective:  Lacking some functionality or property ordinarily characteristic of its kind.
▸ adjective:  (of technology) Not equipped with intelligent behavior or processing capabilities of its own.
▸ adjective:  (obsolete, rare) Lacking brightness or clearness as a colour; dim, dull.
▸ verb:  (transitive, dated) To silence.
▸ verb:  (transitive) To make stupid.
▸ verb:  (transitive) To represent as stupid.
▸ verb:  (transitive) To reduce the intellectual demands of.
▸ adverb:  (African-American Vernacular) Very, extremely.
▸ adjective:  (African-American Vernacular, dated) An intensifier expressing contempt; damn, damned.
▸ Also see dumb

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