infernal

adjective

1
expletives used informally as intensifiers
he's a blasted idiot
it's a blamed shame
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
3
being of the underworld
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

Also useful for “infernal”:Unscrambler— Rearrange the letters in “infernal”