a foolish person
WordReference Random House Learner's Dictionary of American English © 2025
knuck•le•head /ˈnʌkəlˌhɛd/USA pronunciation
n. [countable][Informal.]
WordReference Random House Unabridged Dictionary of American English © 2025- Informal Termsa stupid or foolish person.
knuck•le•head
(nuk′əl hed′),USA pronunciation n. [Informal.]
knuck′le•head′ed, adj.
- Informal Termsa stupid, bumbling, inept person.
- knuckle + head 1940–45
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