/ Thesaurus / N Synonyms of nefariously Find synonyms for: Adverb1. nefariouslyusage: in a nefarious manner or to a nefarious degree; "nefariously involved in a conspiracy"WordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: anecdote Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language