/ Dictionary / Index N nefarious: Meaning and Definition of Find definitions for: ne•far•i•ous Pronunciation: (ni-fâr'ē-us), [key] — adj. extremely wicked or villainous; iniquitous: a nefarious plot. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: nefarious (Thesaurus) nef Nefertem Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language