(a.) Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; devilish; infernal; impious; atrocious; nefarious; outrageously wicked; as, a diabolic or diabolical temper or act.

Draconian Mephistophelian Tartarean animal anthropophagous atrocious barbaric barbarous beastly bestial bloodthirsty bloody bloody-minded brutal brutalized brute brutish cannibalistic cruel cruel-hearted cursed damnable demoniac demoniacal demonic demonish demonlike devil-like devilish diabolic execrable fell feral ferocious fiendish fiendlike fierce ghoulish hellborn hellish infernal inhuman inhumane murderous ogreish ruthless sadistic sanguinary sanguineous satanic savage sharkish slavering subhuman truculent unchristian uncivilized ungodly unhuman vicious wolfish