°Unable to
speak; lacking power of speech.
"His younger brother was born dumb, and communicated with sign language."
°Of or pertaining to something, especially a person, that is extremely
stupid.
"You are so dumb because you don't even know how to make toast!"
verb
synonyms:
dumbstruck, mute, speechless, wordless
more»
, feeble-minded, idiotic, moronic, stupid, banal, brainless, dopey, silly, ridiculous, vulgar