Search Result for "diabolic": 
Wordnet 3.0

ADJECTIVE (2)

1. showing the cunning or ingenuity or wickedness typical of a devil;
- Example: "devilish schemes"
- Example: "the cold calculation and diabolic art of some statesmen"
- Example: "the diabolical expression on his face"
- Example: "a mephistophelian glint in his eye"
[syn: devilish, diabolic, diabolical, mephistophelian, mephistophelean]

2. extremely evil or cruel; expressive of cruelty or befitting hell;
- Example: "something demonic in him--something that could be cruel"
- Example: "fires lit up a diabolic scene"
- Example: "diabolical sorcerers under the influence of devils"
- Example: "a fiendish despot"
- Example: "hellish torture"
- Example: "infernal instruments of war"
- Example: "satanic cruelty"
- Example: "unholy grimaces"
[syn: demonic, diabolic, diabolical, fiendish, hellish, infernal, satanic, unholy]



The Collaborative International Dictionary of English v.0.48:

Diabolic \Di`a*bol"ic\, Diabolical \Di`a*bol"ic*al\, a. [L.
   diabolicus, Gr. ? 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 + WordNet 1.5] -- Di`a*bol"ic*al*ly,
        adv. -- Di`a*bol"ic*al*ness, n.


WordNet (r) 3.0 (2006):

diabolic
    adj 1: showing the cunning or ingenuity or wickedness typical of
           a devil; "devilish schemes"; "the cold calculation and
           diabolic art of some statesmen"; "the diabolical
           expression on his face"; "a mephistophelian glint in his
           eye" [syn: devilish, diabolic, diabolical,
           mephistophelian, mephistophelean]
    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" [syn: demonic,
       diabolic, diabolical, fiendish, hellish, infernal,
       satanic, unholy]


Moby Thesaurus II by Grady Ward, 1.0:

93 Moby Thesaurus words for "diabolic":
   Draconian, Mephistophelian, Tartarean, abominable, accursed,
   animal, anthropophagous, appalling, atrocious, awful, bad,
   barbaric, barbarous, base, beastly, bestial, bloodthirsty, bloody,
   bloody-minded, brutal, brutalized, brute, brutish, cannibalistic,
   corrupt, cruel, cruel-hearted, cursed, damnable, demoniac,
   demoniacal, demonic, demonish, demonlike, depraved, devil-like,
   devilish, diabolical, dreadful, evil, execrable, fell, feral,
   ferocious, fiendish, fiendlike, fierce, flagitious, foul, ghoulish,
   heinous, hellborn, hellish, hideous, horrible, horrid, ill,
   impious, infernal, inhuman, inhumane, iniquitous, maleficent,
   malevolent, malicious, malign, monstrous, murderous, odious,
   ogreish, ruthless, sadistic, sanguinary, sanguineous, satanic,
   savage, serpentine, sharkish, sinful, sinister, slavering,
   subhuman, terrible, truculent, unchristian, uncivilized, ungodly,
   unhallowed, unhuman, vicious, vile, wicked, wolfish