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From Latin nefandus, from ne- ‎(not) + fandus, gerundive of fārī ‎(to speak).



nefandous ‎(comparative more nefandous, superlative most nefandous)

  1. Unspeakable, appalling.
    • 1684, Increase Mather, An Essay for the Recording of Illustrious Providences:
      Also the Daemon belched forth most horrid and nefandous Blasphemies, exalting himself above the most High.
    • 1931, H.P. Lovecraft, At the Mountains of Madness
      It had only horror, because I knew unerringly the monstrous, nefandous analogy that had suggested it.
    • 1999, Neal Stephenson, Cryptonomicon
      some combination of scrapie, long-term climatic change, nefandous conduct by jealous Outer Qwghlmians, and a worldwide shift in fashion away from funny-smelling thirty-pound sweaters with small arthropods living in them had driven them all into honest poverty and then not-so-honest poverty and led to their forcible transportation to Australia.