Whit

King James Dictionary

Whit, n. L. A point a jot the smallest part or particle imaginable. It is used without a preposition. He is not a whit the wiser for experience.

It does not me a whit displease.

The regular construction would be by a whit, or in a whit. In these phrases, a whit may be interpreted by in the least, in the smallest degree.

Webster's Dictionary

(n.) The smallest part or particle imaginable; a bit; a jot; an iota; - generally used in an adverbial phrase in a negative sentence.