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See: fatuous, mute, speechless, taciturn

DEAF, DUMB, AND BLIND. A man born deaf, dumb, and blind, is considered an idiot. (q.v.) 1 Bl. Com. 304; F. N. B. 233; 2 Bouv. Inst. n. 2111.

DUMB. One who cannot speak; a person who is mute. See Deaf and dumb, Deaf, dumb, and blind; Mute, standing mute.

References in periodicals archive ?
Katzman, ``I don't think we're dumbing down the test in any way.
Not so much dumbing down as dumbing down to a derelict dunny in the Australian outback.
But Liberal Democrat Lord Razzall attacked the deal to keep Dipsy, Laa-Laa, Po and Tinky Winky as "less a case of dumbing down, more of dumbing out".