Definition
'Witless' means lacking intelligence or good sense; foolish. It suggests a more pronounced lack of wit than simply being naive. It's similar to 'nitwitted' but perhaps slightly more formal. Unlike being clever or astute, a witless person consistently makes poor decisions or says foolish things. Think of a character in a comedy who is constantly the butt of jokes because of their stupidity. The term implies a notable absence of mental sharpness.