Infernal definition

(1) 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"

(2) 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"

(3) Being of a lower world of the dead

"Infernal regions"

(4) Characteristic of or resembling hell

"Infernal noise"

"Infernal punishment"

(5) Of or pertaining to or characteristic of a very uncontrolled and intense fire

"Infernal heat"

(6) An inhabitant of hell

"His roar made the infernals quake"