GNU Collaborative International Dictionary of English

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  1.       
    
    { Diabolic , Diabolical , } a. [L. diabolicus, Gr. διαβολικός devilish, slanderous: cf. F. diabolique. See Devil.]
    1. Pertaining to the devil; resembling, or appropriate, or appropriate to, the devil; befitting hell or satan; devilish; infernal; impious; as, a diabolic or diabolical temper or act; the diabolical expression on his face; fires lit up a diabolic scene.Diabolic power.” Milton. “The diabolical institution.” Motley.
      Syn. -- devilish, mephistophelian, mephistophelean.
      1913 Webster
    2. showing a wicked cunning or ingenuity; as, the cold calculation and diabolic art of some statesmen.
      Syn. -- devilish, mephistophelian, mephistophelean.
      WordNet 1.5
    3. extremely evil or cruel; atrocious; outrageously wicked; as, diabolical sorcerers under the influence of devils; diabolical torturers taking pleasure in their craft.
      Syn. -- demonic, fiendish, hellish, infernal, nefarious, satanic.
      1913 Webster
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      WordNet 1.5

      -- Di`a*bol"ic*al*ly, adv. -- Di`a*bol"ic*al*ness, n.