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. Hanukkah Origins of the Christmas Holiday Jewish Holidays, 2010-2030 (A.M. 5770-5791) Western Christian Holidays, 2010-2030 Krampus: The Christmas Devil Kwanzaa ✖ Related Content Daily Word Quiz: tintinnabulation Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language