knucklehead

American  

[nuhk-uhl-hed] / ˈnʌk əlˌhɛd /

noun

Informal.

1. a stupid, bumbling, inept person.

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knucklehead British  

/ ˈnʌkəlˌhɛd /

noun

1. informal fool; idiot

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Other Word Forms

• knuckleheaded adjective

Etymology

Origin of knucklehead

First recorded in 1940–45; knuckle + head

Explanation

A knucklehead is someone who is a dunce or does something foolish. You might criticize your friend's baking skills by saying, "You used salt instead of sugar, you knucklehead!" Knucklehead is an informal term that can come across as joking rather than insulting, depending how you use it. A pair of brothers might call each other knuckleheads in a fond way: "Hang on, I'm coming with you on your bike ride, you knucklehead!" The word is uniquely American, coined in the late nineteenth century, but made popular in the 1940s by an Army recruitment character known as "R. F. Knucklehead."

Example Sentences

He has previously branded Powell a "knucklehead" and claimed he was "doing a lousy job" after his repeated calls for interest rate cuts were ignored.

From BBC • Apr. 15, 2026

These are the same owners who signed notorious knucklehead Trevor Bauer because he agreed to a bargain deal.

From Los Angeles Times • May 18, 2023

"Civil rights can be violated and that person can still be a knucklehead, you know what I'm saying?"

From Salon • Dec. 21, 2022

“If Twitter becomes the go-to platform for the knucklehead brigade, advertisers will run, not walk.”

From New York Times • Oct. 28, 2022

Dad raised his head and said, “Why are you asking how it happened? Can’t you tell, Wilona? This little knucklehead was kissing his reflection in the mirror and got his Ups stuck!”

From "The Watsons Go to Birmingham" by Christopher Paul Curtis

Related Words

• dummy