Adjectives

(a)uglydispleasing to the senses“an ugly face”, “ugly furniture”
(s)surly, uglyinclined to anger or bad feelings with overtones of menace“a surly waiter”, “an ugly frame of mind”
(s)despicable, ugly, vile, slimy, unworthy, worthless, wretchedmorally reprehensible“would do something as despicable as murder”, “ugly crimes”, “the vile development of slavery appalled them”, “a slimy little liar”
(s)atrocious, frightful, horrifying, horrible, uglyprovoking horror“an atrocious automobile accident”, “a frightful crime of decapitation”, “an alarming, even horrifying, picture”, “war is beyond all words horrible” (Winston Churchill), “an ugly wound”