Definitions for knuckleheadˈnʌk əlˌhɛd
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Random House Webster's College Dictionary
knuck•le•head*ˈnʌk əlˌhɛd(n.)
a stupid, bumbling, inept person.
Category: Informal
* Informal..
Origin of knucklehead:
1940–45
knuck′le•head`ed(adj.)
Princeton's WordNet
dunce, dunderhead, numskull, blockhead, bonehead, lunkhead, hammerhead, knucklehead, loggerhead, muttonhead, shithead, dumbass, fuckhead(noun)
a stupid person; these words are used to express a low opinion of someone's intelligence
Wiktionary
knucklehead(Noun)
An idiot; a stupid or inept person
Don't stick that screwdriver into the live electrical outlet, you knucklehead!
Citation
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"knucklehead." Definitions.net. STANDS4 LLC, 2013. Web. 25 May 2013. <http://www.definitions.net/definition/knucklehead>.