definition of
infernal

[1] #1 infernal a. characteristic of or resembling Hell; "infernal noise"; "infernal punishment". wn

[2] #2 infernal s. [demonic, diabolic, diabolical, fiendish, hellish, satanic, unholy] extremely evil or cruel; expressive of cruelty or befitting hell; "something demonic in him--something that could be cruel"; "fires lit up a diabolic scene"; "diabolical sorcerers under the influence of devils"; "a fiendish despot"; "hellish torture"; "in. wn

[3] #3 infernal s. [blasted, blame, blamed, blessed, damn, damned, darned, deuced, goddam, goddamn, goddamned] expletives used informally as intensifiers; "he's a blasted idiot"; "it's a blamed shame"; "a blame cold winter"; "not a blessed dime"; "I'll be damned (or blessed or darned or goddamned) if I'll do any such thing"; "he's a damn (or goddam or goddamned) f. wn

[4] #4 infernal n. an inhabitant of Hell; "his roar made the infernals quake". wn

[5] #5 infernal a. of or pertaining to or characteristic of a very uncontrolled and intense fire; "infernal heat". wn