Source : Webster's Revised Unabridged Dictionary (1913)

Diabolize \Di*ab"o*lize\, v. t.
   To render diabolical. [R.]

Source : WordNet®

diabolize
     v : turn into a devil or make devilish; "Man devilized by war"
         [syn: {devilize}, {devilise}, {diabolise}]