Nefarious \Ne*fa"ri*ous\, a. [L. nefarius, fr. nefas crime, wrong; ne not + fas divine law; akin to fari to speak. See {No}, adv., and {Fate}.] Wicked in the extreme; abominable; iniquitous; atrociously villainous; execrable; detestably vile. Syn: Iniquitous; detestable; horrible; heinious; atrocious; infamous; impious. See {Iniquitous}. -- {Ne*fa"ri*ous*ly}, adv. -- {Ne*fa"ri*ous*ness}, n. web1913
nefarious adj : extremely wicked; "nefarious schemes"; "a villainous plot"; "a villainous band of thieves" [syn: {villainous}] wn