Breadcrumb Home > Thesaurus > P Synonyms of pitilessly Find synonyms for: Adverb1. mercilessly, pitilessly, unmercifully, remorselesslyusage: without pity; in a merciless manner; "he was mercilessly trounced by his opponent in the House"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: perambulate Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language