Breadcrumb Home > Thesaurus > D Synonyms of dastardly Find synonyms for: Adjective 1. dastard(prenominal), dastardly, cowardly (vs. brave), fearful usage: despicably cowardly; "the unprovoked and dastardly attack by Japan on...December 7th"- F.D. Roosevelt WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of dastardly (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: locution Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language