A stupid person. Because the word isn't in great usage right now, referring to a person as a "nitwit" can be considered a more intense way of insulting them.
Tommy: "Cole, you stupid."

Cole: "Eh, whatever, man."

*application of the term*

Tommy: "Cole, you're a complete nitwit."

Cole: "Who do you think you're talking to?"
by Terry Ryzing October 31, 2007

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Top Definition
One with very little intelligence. One who has no fucking clue what they are doing.
George Dubya Bush is a fucking nitwit.
by MUG March 07, 2004

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An idiot, a fool
He's a complete nitwit
by Geoff September 13, 2003

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a stupid person, an idiot
Shut up you nitwit. Leave me alone.
by Light Joker April 26, 2005

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a person who apparently has no inkling as to what they should be doing.
Look at Susie, she's a fuckin nitwit!
by Cbutler January 24, 2004

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some one who is a loser and doesn't know anything.
my friend is such a nit wit for thinking butter isn't a carb.
by asholeemar August 21, 2009

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Something that squidward calls spongebob
Open the door you nitwit
by UToAreToStupid May 01, 2015

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