Breadcrumb Home > Thesaurus > R Synonyms of ruthless Find synonyms for: Adjective 1. pitiless, remorseless, ruthless, unpitying, merciless (vs. merciful), unmerciful usage: without mercy or pity; "an act of ruthless ferocity"; "a monster of remorseless cruelty" WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved.Definition and meaning of ruthless (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: minatory Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language