knucklehead

K5N1U1C3K5L1E1H4E1A1D2
/ˈnʌkl̩ˌhɛd/

noun

An idiot; a stupid or inept person.

“Don't stick that screwdriver into the live electrical outlet, you knucklehead!”

Similar
duncedunderheadnumskullblockheadboneheadlunkheadhammerheadloggerhead
OriginEnglish head ← Middle English heed ← Old English hēafod →
UncommonScrabble 25
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Meanings

nounknucklehead (plural knuckleheads)

plural knuckleheads

  1. derogatoryslangAn idiot; a stupid or inept person.

    Don't stick that screwdriver into the live electrical outlet, you knucklehead!

Synonyms & antonyms

nouna stupid person; these words are used to express a low opinion of someone's intelligence

Similar
duncedunderheadnumskullblockheadboneheadlunkheadhammerheadloggerheadmuttonheadshitheaddumbassfuckhead
Broader
stupidstupid personstupe
Also see
blockheadboneheaddumbassduncedunderheadfoolfuckheadhammerheadidiotloggerheadlunkheadmuttonheadnumskullshithead

Synonym sets from Open English WordNet, CC BY 4.0.

Origin

  1. Englishknuckle
  2. Proto-Indo-European*kap-?
  3. Proto-Indo-European*kap-
  4. Proto-Indo-European*káput
  5. Proto-Germanic*haubudą
  6. Old Englishhēafod
  7. Middle Englishheed
  8. Englishhead
  9. Englishknucklehead

From knuckle + head.

Full word history & related roots →
Cite this entry
APA

knucklehead. (n.d.). In WatkinsX Dictionary. Retrieved November 2, 2026, from https://dictionary.watkinsx.com/word/knucklehead

MLA

“knucklehead.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/knucklehead. Accessed November 2, 2026.

Chicago

WatkinsX Dictionary, s.v. “knucklehead,” accessed November 2, 2026, https://dictionary.watkinsx.com/word/knucklehead.

Source: knucklehead on Wiktionary, CC BY-SA 4.0.