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dumb as a doorknob
Adjective
Meaning
(as) dumb as a doorknob
(simile, slang) Very stupid.
Source: en.wiktionary.org
Synonyms
unread
mentally retarded
softheaded
unscholarly
hebete
Antonyms
literate
encyclopedic
nimble
sly
lettered
knower
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Close letter words and terms
dumb as a bag of hammers
dumb as a box of rocks
dumb as a brick
dumb as a doornail
dumb as a post
dumb as a rock