infernal

Extremely evil or cruel; expressive of cruelty or befitting hell.

“infernal instruments of war”

Expletives used informally as intensifiers.

“an infernal nuisance”

Being of the underworld.

“infernal regions”

An inhabitant of Hell.

“his roar made the infernals quake”

Characteristic of or resembling Hell.

“infernal noise”

“infernal punishment”

Of or pertaining to or characteristic of a very uncontrolled and intense fire.

“infernal heat”