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dumber

ADJECTIVE
unable to speak
Synonyms
STRONGEST
speechless
WEAK
at a loss for words inarticulate incoherent mousy mum mute quiet silent soundless tongue-tied uncommunicative voiceless wordless
Antonyms
WEAK
bright intelligent sharp smart speaking
ADJECTIVE
stupid, unintelligent
Synonyms
STRONGEST
dull foolish
WEAK
dense dim-witted doltish feebleminded moronic simple-minded thick
Antonyms
WEAK
bright intelligent sharp smart speaking

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.