Definition of infernal
(adj)
characteristic of or resembling Hell; "infernal noise"; "infernal punishment"
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"; "infernal instruments of war"; "satanic cruelty"; "unholy grimaces"
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) fool"; "a deuced idiot"; "an
infernal nuisance"
being of the underworld; "infernal regions"