dumb

adjective

• 1(of a person) unable to speak, most typically because of congenital deafness:he was born deaf, dumb, and blind
• (of animals) unable to speak as a natural state and thus regarded as helpless or deserving pity.
• [predic.] temporarily unable or unwilling to speak:she stood dumb while he poured out a stream of abuse
• [attributive] resulting in or expressed by speechlessness:they stared in dumb amazement

• 2 informal, chiefly North American stupid:a dumb question

• 3(of a computer terminal) able only to transmit data to or receive data from a computer; having no independent processing capability. Often contrasted with intelligent.

verb

• 1 (dumb something down) informal simplify or reduce the intellectual content of something so as to make it accessible to a larger number of people:the producers categorically deny that they’re dumbing down the show
• [no object] (dumb down) become less intellectually challenging:the need to dumb down for mass audiences

• 2 literary make dumb or unheard; silence:a splendour that dazed the mind and dumbed the tongue