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Adjective: fiendish  feen-dish
  1. Extremely evil or cruel; expressive of cruelty or befitting hell
    "a fiendish despot";
    - demonic, diabolic, diabolical, hellish, infernal, satanic, unholy
  2. Very difficult
    "the puzzles are fiendish"

See also: difficult, evil, hard

Encyclopedia: Fiendish