emphasis You describe something as hellish to emphasize that it is extremely unpleasant. The atmosphere in Washington is hellish. extremely bad or difficult
Of or pertaining to hell; like hell; infernal; malignant; wicked; detestable; diabolical
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"