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Adjective: hellish  he-lish
  1. Very unpleasant
    "hellish weather";
    - beastly, god-awful, hellacious [N. Amer], horrible
  2. Extremely evil or cruel; expressive of cruelty or befitting hell
    "hellish torture";
    - demonic, diabolic, diabolical, fiendish, infernal, satanic, unholy

See also: evil, unpleasant

Encyclopedia: Hellish