No thing; not anything: The box contained nothing. I've heard nothing about it. No part; no portion: Nothing remains of the old house but the cellar hole. One of no consequence, significance, or interest: The new nonsmoking policy is nothing to me. Something that has no existence. Something that has no quantitative value; zero: a score of two to nothing. One that has no substance or importance; a nonentity: "A nothing is a dreadful thing to hold onto\u201d ( Edna O'Brien). Insignificant or worthless: "the utterly nothing role of a wealthy suitor\u201d ( Bosley Crowther). In no way or degree; not at all: She looks nothing like her sister. for nothing Free of charge. for nothing To no avail: all that trouble for nothing. for nothing For no reason: fired him for nothing. in nothing flat In very little time; very quickly. nothing doing Informal Certainly not.