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Definitions

American Heritage® Dictionary of the English Language, Fourth Edition

  1. n. Informal A stupid person; a blockhead.

Wiktionary

  1. n. An idiot; a stupid or inept person

WordNet 3.0

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

Examples

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Comments

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‘knucklehead’ has been looked up 1973 times, added to 19 lists, commented on 2 times, and has a Scrabble score of 20.