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Adjective: diabolical  ,dI-u'bó-li-kul
  1. Showing the cunning, 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

Encyclopedia: Diabolical

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diabetic acidosis
diabetic coma
diabetic diet
diabetic retinopathy
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diablo
diablotin
diabolatry
diabolic
diabolical
diabolically
diabolise
diabolism
diabolist
diabolize
diabolo
Diacalpa
diacatholicon
diacetylmorphine
diachronic