dumb as a doorknob

adjective

Very stupid.

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Meanings

adjective(as) dumb as a doorknob
  1. slangsimileVery stupid.

Synonyms & antonyms

Also see
not the sharpest tool in the shedstupid
Cite this entry
APA

dumb as a doorknob. (n.d.). In WatkinsX Dictionary. Retrieved November 5, 2026, from https://dictionary.watkinsx.com/word/dumb%20as%20a%20doorknob

MLA

“dumb as a doorknob.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/dumb%20as%20a%20doorknob. Accessed November 5, 2026.

Chicago

WatkinsX Dictionary, s.v. “dumb as a doorknob,” accessed November 5, 2026, https://dictionary.watkinsx.com/word/dumb%20as%20a%20doorknob.

Source: dumb as a doorknob on Wiktionary, CC BY-SA 4.0.