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Adjective: diabolical  `dIu'bólikul
  1. Showing the cunning or ingenuity or wickedness typical of a devil
    "the diabolical expression on his face"
    - devilish, diabolic, mephistophelian, mephistophelean
     
  2. Extremely evil or cruel; expressive of cruelty or befitting hell
    "diabolical sorcerers under the influence of devils"
    - demonic, diabolic, fiendish, hellish, infernal, satanic, unholy

See also: evil

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