/ Thesaurus / E Synonyms of erroneously Find synonyms for: Adverb1. mistakenly, erroneouslyusage: in a mistaken manner; "he mistakenly believed it"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language