/ Thesaurus / U Synonyms of unfaithfully Find synonyms for: Adverb1. unfaithfully, undependably, unreliablyusage: in an unfaithful undependable unreliable mannerWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: philanthropy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language