Breadcrumb Home > Thesaurus > C Synonyms of crucially Find synonyms for: Adverb1. cruciallyusage: to a crucial degree; "crucially important"; "crucially, he must meet us at the airport"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. ✖ Related Content Daily Word Quiz: sophism Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language