Definition of 'hellish'

Adjective

1. very unpleasant; "hellish weather"; "stop that god-awful racket"
      Synonyms: beastly god-awful
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"
      Synonyms: demonic diabolic diabolical fiendish infernal satanic unholy

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