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lunkhead

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