adj. 25B6; adjective
the infernal regions : HELLISH, lower, nether, subterranean, underworld, chthonic; Hadean, Tartarean.
(informal) an infernal nuisance : DAMNABLE, wretched; annoying, irritating, infuriating, exasperating; informal damned, damn, flaming, blasted, blessed, pesky, aggravating; Brit. informal blinking, blooming, flipping; Brit. informal, dated bally, ruddy.