Satanic

satanic
    adj 1: extremely evil or cruel; expressive of cruelty or
           befitting hell; "something demonic in him--something that
           could be cruel"; "fires lit up a diabolic scene";
           "diabolical sorcerers under the influence of devils"; "a
           fiendish despot"; "hellish torture"; "infernal
           instruments of war"; "satanic cruelty"; "unholy grimaces"
           [syn: {demonic}, {diabolic}, {diabolical}, {fiendish},
           {hellish}, {infernal}, {satanic}, {unholy}]
    2: of or relating to Satan; "Satanic verses"
    

Satanic \Sa*tan"ic\, Satanical \Sa*tan"ic*al\, a. [Cf. F.
   satanique, Gr. ?.]
   Of or pertaining to Satan; having the qualities of Satan;
   resembling Satan; extremely malicious or wicked; devilish;
   infernal. "Satanic strength." "Satanic host." --Milton.
   [1913 Webster]

         Detest the slander which, with a Satanic smile, exults
         over the character it has ruined.        --Dr. T.
                                                  Dwight.
   [1913 Webster] -- {Sa*tan"ic*al*ly}, adv. --
   {Sa*tan"ic*al*ness}, n.
   [1913 Webster]
    

94 Moby Thesaurus words for "satanic":
      Draconian, Mephistophelian, Tartarean, abhorrent, abominable,
      amoral, animal, anthropophagous, atrocious, barbaric, barbarous,
      beastly, bestial, black, bloodthirsty, bloody, bloody-minded,
      brutal, brutalized, brute, brutish, cannibalistic, corrupt, cruel,
      cruel-hearted, cursed, damnable, dark, demoniac, demoniacal,
      demonic, demonish, demonlike, depraved, despicable, devil-like,
      devilish, diabolic, diabolical, dire, evil, execrable, fell, feral,
      ferocious, fiendish, fiendlike, fierce, ghoulish, godless, heinous,
      hellborn, hellish, hideous, horrendous, horrible, horrid,
      horrifying, immoral, impious, infernal, inhuman, inhumane,
      iniquitous, loathsome, monstrous, murderous, ogreish, perverse,
      perverted, ruthless, sadistic, sanguinary, sanguineous, saturnine,
      savage, serpentine, sharkish, sinister, slavering, subhuman,
      truculent, unchristian, uncivilized, ungodly, unhallowed, unholy,
      unhuman, unspeakable, unutterable, vicious, vile, wicked,
      wolfish