Adjektive
ugly [ uglier ; ugliest]
hideous [ more hideous ; most hideous]
monstrous [ more monstrous ; most monstrous ]
grotesque [ more grotesque ; most grotesque]
macabre [ more macabre ; most macabre ]
horrid [ more horrid ; most horrid]
unsightly [ more unsightly ; most unsightly ]
shapeless {arts}, [ more shapeless ; most shapeless]
unpleasant [ more unpleasant ; most unpleasant]
lurid [ more lurid ; most lurid ]
unlovely [ more unlovely ; most unlovely ]
ungraceful [ more ungraceful ; most ungraceful]
unhandsome [ more unhandsome/unhandsomer ; most unhandsome/unhandsomest]
repulsive {feelings & emotions}
repellent {feelings & emotions}
...
Adverb
Verb
to uglify [ uglified ; uglified ]
to disfigure [ disfigured ; disfigured ]
to distort [ distorted ; distorted ]