a slow-witted, stupid, or foolish person.

1920–25; nit (< German; dialectal variant of nicht not) + wit

fool, blockhead, dolt, dunce, booby. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
nitwit (ˈnɪtˌwɪt)
informal a foolish person
[C20: perhaps from nit1 + wit1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1922, from nit "nothing," from Ger. dial. or Yiddish, from M.L.G. (see nix) + wit.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Such a nitwit conspiracy among a large group of scientists would have a half-life of about three seconds tops.
Chalmers is a nitwit and an opportunist who steals ideas from others.
Now it seems you righties want him to be a secret nitwit as well.
Another nitwit cog in the wheel trying to make it palatable, and for you suckers out there, don't worry it'll get better.
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