from The American Heritage® Dictionary of the English Language, 4th Edition
- n. A stupid or silly person.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A scatterbrained or stupid person.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. a stupid incompetent person
Probably obsolete nit, nothing (from German dialectal, from Middle High German niht, nit; see nix2) + wit1.(American Heritage® Dictionary of the English Language, Fourth Edition)
nit + wit (Wiktionary)