uglify

verb3

1. •
   To make ugly; to destroy or worsen the appearance or attractiveness of.

   • She uglifies every thing near her. — 1792
2. •
   To become ugly.

   • Inevitably those bodies age and uglify under her influence, but if they are outstandingly beautiful at the outset, that process takes longer. — 1986
3. •
   Synonym of minify.