(a.) of or pertaining to hell; like hell; infernal; malignant; wicked; detestable; diabolical.

Acherontic Draconian Lethean Mephistophelian Plutonian Plutonic Stygian Tartarean anarchic angry animal anthropophagous atrocious barbaric barbarous beastly bestial bloodthirsty bloody bloody-minded blustering blusterous blustery brutal brutalized brute brutish cannibalistic chaotic chthonian chthonic cruel cruel-hearted cursed damnable demoniac demoniacal demonic demonish demonlike devil-like devilish diabolic execrable fell feral ferocious fiendish fiendlike fierce frantic frenzied furious ghoulish hellborn infernal infuriate inhuman inhumane insensate mad mindless murderous ogreish orgasmic orgastic pandemoniac pandemonic purgatorial raging ravening raving rip-roaring ruthless sadistic sanguinary sanguineous satanic savage sharkish slavering storming stormy subhuman sulfurous tempestuous troublous truculent tumultuous turbulent unchristian uncivilized ungodly unhuman uproarious vicious wild wolfish