Whit

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

Thesaurus Entries

ace, atom, bit, dab, damn, dole, dot, dram, dribble, driblet, dwarf, farthing, fleck, flyspeck, fragment, gobbet, grain, granule, groat, hair, handful, hoot, iota, jot, little, little bit, lota, minim, minimum, minutiae, mite, modicum, molecule, mote, nutshell, ounce, particle, pebble, pinch, pittance, point, scruple, shred, smidgen, smitch, speck, spoonful, spot, thimbleful, tiny bit, tittle, trifling amount, trivia, whoop