American Heritage Dictionary
(1)
Century Dictionary
GNU Webster's 1913
WordNet
(1)
Elsewhere on the web
My Glugsterof course … he and the knucklehead are the only two people who are guaranteed an answered call!— Angel's Mind
Coens follow Oscar-winning drama with 'knucklehead' comedy starring Pitt, Clooney— JAM! Showbiz
This time, Clooney is joined by Brad Pitt to portray "knucklehead" characters in "Burn After Reading" - roles penned especially for them.— JAM! Showbiz
This knucklehead was holding up everyone for who knows what kind of prank.— Marine Corps Moms
And when the leader of the opposition is a knucklehead, our adversarial political system falls down like a broken bicycle.— BC Bloggers

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