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Definition of infernal : 1. An inhabitant of the infernal regions; also, the place itself.
2. Of or pertaining to or suitable for the lower regions, inhabited, according to the ancients, by the dead; pertaining to Pluto's realm of the dead, the Tartarus of the ancients.

Synonyms:

demonic, cursed, beatified, evil, fiendish, damn, chthonian, goddamn, kind, Stygian, deuced, goddam, mephistophelean, devilish, bloody, confounded, darn, chthonic, goddamned, Tartarean, damned, wicked, unredeemed, ghoulish, hadean, like, darned, ethereal, blessed, blamed, sinful, subterranean, satanic, ruddy, doomed, ogreish, blame, god-awful, blest, divine, unsaved, underworld, execrable, blooming, diabolical, everlasting, accursed, blasted, unhallowed, mephistophelian, beastly, nether, lower, curst, satanical, Plutonian, unholy

diabolic, abysmal, horrific, hellish

Usage examples:

• Were you pulling that infernal little fire- brand's short leg, or did you mean it?" - "A Poached Peerage", William Magnay.
• " I'm afraid not," replied Castellan, " and we can only hope that our Lords of the Council will be of the same opinion, or, better still, that the infernal thing we saw belongs to us." - "The World Peril of 1910", George Griffith.
• You are getting as much of a danger as this infernal girl. - "The Man Who Knew", Edgar Wallace.