1. ugly
2. disfigured, grotesque, monstrous, unnatural, hideous, repulsive, ill-favored, ill-favoured, scrofulous, unsightly, unlovely, unpicturesque, displeasing, unattractive, awkward, inaesthetic
3. unaesthetic, surly
4. ill-natured, despicable
5. vile, unworthy, evil, wicked, baleful
6. forbidding, menacing, minacious, minatory, ominous, sinister, threatening, alarming, atrocious
6. frightful, horrifying, horrible, alarming