adjective
definition
(dated) Unable to speak; lacking power of speech (kept in "deaf, dumb, and blind").
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(archaic) Not talkative; taciturn or unwilling to speak.
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(dated) Having no input or voice in running things.
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(dated, of things, actions, etc.) Unaccompanied by words or speech, silent, wordless.
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(dated) Not producing any sound, silent.
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(informal, derogatory, especially of a person) Stupid.
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(figuratively) Pointless, foolish, lacking intellectual content or value.
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Lacking some functionality or property ordinarily characteristic of its kind.
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(of technology) Not equipped with intelligent behavior or processing capabilities of its own.
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(obsolete, rare) Lacking brightness or clearness as a colour; dim, dull.