The Oxford Thesaurus An A-Z Dictionary of Synonyms - satanic adj.

1) diabolic(al) , fiendish, devilish, Mephistophelian, demonic, demoniac(al) , infernal, cacodemonic, ghoulish, hellish, infernal, evil, wicked, iniquitous, corrupt, depraved, perverted, perverse, godless, ungodly, impious, unholy, sinister, dark, black, immoral, amoral: They practise witchcraft and other satanic inventions. 2) dire, monstrous, heinous, atrocious, hideous, horrible, horrendous, horrid, horrifying, loathsome, vile, abhorrent, unspeakable, unutterable, damnable, despicable, abominable: The miners worked under positively satanic conditions.