Diabolical

Adjective

 * 1) Extremely wicked or cruel.
 * 2) Of or concerning the devil; satanic.

Derived terms

 * diabolically
 * diabolicalness

Related terms

 * diabolic

Thesaurus
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

Etymology
First attested between 1350 and 1400 from Middle English diabolik, from Middle French diabolique, from Late Latin diabolicus, from διαβολ-ικός:, from διάβολος:.