Below are possible answers for the crossword clue Hellish.
8 letter answer(s) to hellish
INFERNAL
an inhabitant of Hell; "his roar made the infernals quake"
being of the underworld; "infernal regions"
characteristic of or resembling Hell; "infernal noise"; "infernal punishment"
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"
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"
of or pertaining to or characteristic of a very uncontrolled and intense fire; "infernal heat"
7 letter answer(s) to hellish
STYGIAN
dark and dismal as of the rivers Acheron and Styx in Hades; "in the depths of an Acheronian forest"; "upon those roseate lips a Stygian hue"-Wordsworth