GNU Collaborative International Dictionary of English

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    Nefarious , 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.
    1913 Webster

    Syn. -- Iniquitous; detestable; horrible; heinious; atrocious; infamous; impious. See Iniquitous.

    1913 Webster

    -- Ne*fa"ri*ous*ly, adv. -- Ne*fa"ri*ous*ness, n.

    1913 Webster