Definition of "nitwit"

If you don't remember you are a nitwit. If you do answer, well, you know what the penalty is for perjury.

1918, State Bar Association of Connecticut, Annual Report, page 82

"Don't be a nitwit, honey!" says Adele. "Here, let me open the door! Ma be I did leave them lights on, though it ain't ike me!"

1922, Nina Wilcox Putnam, Laughter Inc