Definition: nefarious

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Source: WordNet (r) 1.7 

nefarious
     adj : extremely wicked; "nefarious schemes"; "a villainous plot";
           "a villainous band of thieves" [syn: villainous]

Source: Webster's Revised Unabridged Dictionary (1913) 

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.