Source : Webster's Revised Unabridged Dictionary (1913)

Uglify \Ug"li*fy\, v. t. [Ugly + -fy.]
   To disfigure; to make ugly. [R.] --Mad. D'Arblay.

Source : WordNet®

uglify
     v : make ugly [ant: {beautify}]
     [also: {uglified}]