/ Thesaurus / S Synonyms of steadfastly Find synonyms for: Adverb1. firm, firmly, steadfastly, unwaveringlyusage: with resolute determination; "we firmly believed it"; "you must stand firm"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: endear Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language