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

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