noun, slang ·Common ·High school level

Definitions

Noun

1. 1
   An idiot; a stupid or inept person. derogatory, slang

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

2. 2
   a stupid person; these words are used to express a low opinion of someone's intelligence wordnet

Synonyms

All synonyms

addlebrainaddleheadaddlepateairheadassweedbeefhead

Antonyms

All antonyms

brain surgeonrocket scientist

Example

More examples

"Only a knucklehead would do that."

Etymology

From knuckle + head.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.