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Definition of boneheaded

boneheaded

/ˈboʊnˌhɛd.ɪd/
bone · head · ed
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boneheaded Lexical Profile

boneheaded Game Scores & Validity

• adjective

1

North American Characterized by a complete lack of common sense, foresight, or intelligence; foolish or stupid.

Example

"Leaving the car windows rolled down right before a forecasted thunderstorm was a truly boneheaded mistake."

Synonyms
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Antonyms
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• Nearby Words

bone-tired
bonefish
bonehead
boneheaded
boneheadedness
boneless
bonelessly

Word Origin & Etymology

Coined in early 20th-century American slang (originally popularized in baseball journalism around 1908), based on the humorous image of a person's skull being solid bone all the way through, leaving no room for a brain.

Cite this Entry

Wordmom. (2026). Definition of Boneheaded. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/boneheaded
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