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bonehead

[bohn-hed]Slang.
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noun
  1. a foolish or stupid person; blockhead.
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adjective
  1. being of, by, or for a stupid or unthinking person: a bonehead mistake.
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Origin of bonehead

An Americanism dating back to 1905–10; bone + head
Related formsbone·head·ed, adjectivebone·head·ed·ness, noun
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for boneheaded

bonehead

noun
  1. slang a stupid or obstinate person
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Derived Formsboneheaded, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for boneheaded

bonehead

n.

"stupid person," 1908, from bone (n.) + head (n.). Cf. blockhead, meathead.

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Online Etymology Dictionary, © 2010 Douglas Harper