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lunkhead

[luhngk-hed]
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noun Slang.
  1. a dull or stupid person; blockhead.

Origin of lunkhead

1850–55, Americanism; lunk (perhaps blend of lump1 and hunk) + head
Also called lunk [luhngk] /lʌŋk/.
Related formslunk·head·ed, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for lunk

lunk

noun
  1. an awkward, heavy, or stupid person
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 lunk

n.

"slow-witted person," 1867, American English colloquial, shortened from lunkhead (1852), possibly an altered form of lump (n.) + head (n.)

Online Etymology Dictionary, © 2010 Douglas Harper