Definitions from Wiktionary (dumb as a doorknob)
▸ adjective: (simile, slang) Very stupid.
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▸ adjective: (simile, slang) Very stupid.
Similar:
dumb as a box of rocks,
dumb as nails,
dumb as a rock,
dumb as a stump,
dumb as an ox,
dumb as a brick,
dumb like a fox,
thick as a plank,
doltish,
thick as two short planks,
more...
Opposite:
▸ Words similar to dumb as a doorknob
▸ Usage examples for dumb as a doorknob
▸ Idioms related to dumb as a doorknob
▸ Wikipedia articles (New!)
▸ Popular nouns described by dumb as a doorknob
▸ Words that often appear near dumb as a doorknob
▸ Rhymes of dumb as a doorknob
▸ Invented words related to dumb as a doorknob