Someone really stupid, sometimes, too stupid to realize his own stupidity. The current president of the USA, Donald Trump.
The president of the US is a complete nincompoop, a delusional idiot who thinks that the world revolves around him.
by libertarian against trump February 12, 2017
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A complete elmore, maroon or jackweed. Somebody with shit for brains. A fuck up of the highest order.
Bush elmored Katrina showing what a true nincompoop he really is.
by Mmmm Lewinsky September 26, 2007
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Something I would call a friend if he/she should say summit stupid which is blatenly obvious!
eg.
louisa - i think i just saw a dog fly!
laura - dogs cant fly u nincompoop!
by marcush January 1, 2006
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"Dude, that guy is a nincompoop!"
"omg, hes so stupid, what a nincompoop."
by aylin22fertiz November 14, 2018
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A name for an idiot, but a jokey name
Kim: How do you turn the tv on?
Sarah: like this, you nincompoop
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