nit·wit (nĭt'wĭt')
n.
A stupid or silly person.

[Probably obsolete nit, nothing (from German dialectal , from Middle High German niht, nit; see nix²) + WIT¹.]

---

The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.

---