Synonyms for Ugly:

adj.

dangerous, threatening (adjective)
menacing, pugnacious, cantankerous, treacherous, sinister, violent, vicious, formidable, ominous, evil, bellicose, crabbed, quarrelsome, obnoxious, forbidding, disagreeable, rough, surly, crabby.
deformed (adjective)
misshapen.
gruesome (adjective)
grisly.
rough (adjective)
roily, roiled.
threatening (adjective)
minatory, minacious.
ugly (adjective)
abhorrent, grotesque, repugnant, unpleasing, unpleasant, hideous, plain, unattractive, unaesthetic, homely, repulsive, displeasing, inelegant, odious, disfigured, undesirable, unsightly, unlovely, unappealing, shapeless, Ill-looking, repellent, disagreeable.
unattractive (adjective)
deformed, disfigured, Hard-featured, foul, ill-favored, repulsive, grisly, misshapen, monstrous, frightful, unlovely, homely, plain, unseemly, repugnant, appalling, uncomely, horrid, unsightly, grotesque, hideous, revolting.
unpleasant, disagreeable (adjective)
filthy, vile, mean, odious, wicked, sordid, dirty, messy, repellent, disgusting, despicable, sorry, nasty.
wicked (adjective)
wicked.

n.

detestable. ferocious, disorderly, brutal, bloodthirsty, thuggish, revolting, riotous, foul, murderous, barbarous. nasty, pain, disgusting, unwholesome, horrid, like. crabbed, crabby, cross, grouchy, snappish, petulant, grumpy, irritable, fretful, peevish, ill-tempered, irascible, testy, querulous, snappy, waspish, cranky, bad-tempered, cantankerous, attitude, mean. monstrosity, sight, ugliness, mess, fright. ugly (noun)
ill-natured, repulsive, evil, frightful, wicked, forbidding, unnatural, horrible, ill-favored, monstrous, horrifying, disfigured, unsightly, scrofulous, hideous, sinister, unaesthetic, menacing, baleful, alarming, unworthy, threatening, surly, inaesthetic, minacious, unpicturesque, unlovely, minatory, vile, ominous, atrocious, despicable, grotesque, ill-favoured.

Other synonyms:

monstrosity, Hard-featured, bad-tempered. irascible, roiled, querulous, turbulent, tempestuous, grouchy, irritable, disgusting, ill-tempered, cranky, raging, sordid, petulant, fretful, snappish, grumpy, waspish, cantankerous, crabby, revolting. stormy, roily, testy, ugliness, tumultuous, horrid, crabbed. fright, nasty, peevish, foul, dirty. snappy, unwholesome, rugged. rough, violent, grim. sight, mess. wild. heavy. distorted
deformed.

Usage examples for ugly

  1. " Not less ugly at any rate," said the physician. – The Complete Historical Romances of Georg Ebers by Georg Ebers
  2. Don't you call this a very ugly country? – The Duke's Children by Anthony Trollope
  3. They were so light- yet so ugly – The Testing of Diana Mallory by Mrs. Humphry Ward