lacking the power of speech; mute
naturally incapable of speech
dumb animals
not expressed in uttered words
dumb insolence
unwilling or temporarily unable to speak
not willing to speak
temporarily unable to speak, e.g. from astonishment
struck dumb
devoid of sound
a dumb piano
chiefly NAmer, informal stupid
said of a computer terminal: able to receive and display data but unable to modify or process it
dumbly adv
dumbness noun
[Old English; related to Old English dēaf deaf1]