Breadcrumb Home > Thesaurus > O Synonyms of overkill Find synonyms for: Noun 1. overkill, capability, capableness usage: the capability to obliterate a target with more weapons (especially nuclear weapons) than are required 2. overkill, effort, elbow grease, exertion, travail, sweat usage: any effort that seems to go farther than would be necessary to achieve its goal WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of overkill (Dictionary) TrendingHere are the facts and trivia that people are buzzing about. Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 12 Steps to a New Year New Year's Resolution to Slim Down? Martin Luther King Speeches Books of the Bible: Old Testament Books in Order ✖ Related Content Daily Word Quiz: plebeian Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language