1 unattractive, unlovely, unprepossessing, unsightly, hideous, grotesque, gruesome, ghastly, offensive, repulsive-looking, plain, plain-looking, plain-featured, bad-featured, ill-favoured, dreadful-looking, awful-looking, terrible-looking, horrible-looking, frightful-looking, monstrous-looking, US and Canadian homely:
The Georgian houses were demolished and replaced by ugly tower-blocks.
2 objectionable, disagreeable, unpleasant, offensive, nasty, loathsome, repellent, repugnant, repulsive, noisome, nauseating, nauseous, revolting, sickening, disgusting, obnoxious, mephitic, rotten, corrupt, filthy, vile, heinous, bad, sordid, evil, foul, perverted, immoral, depraved, degenerate, base, debased, detestable, hateful, abominable, execrable, despicable, odious:
The East End murders were among the ugliest crimes of the century. He sprang from his seat with an ugly curse on his lips.
3 disquieting, uncomfortable, discomforting, troublesome, awkward, disadvantageous, ominous, dangerous, perilous, hazardous:
He found himself in a very ugly position, with no apparent means of escape.
4 unpleasant, disagreeable, surly, hostile, nasty, spiteful, bad-tempered, ill-tempered, currish, irascible, curmudgeonly, cantankerous, crabby, crabbed, crotchety, cross, cranky, mean:
He's in an ugly mood till he's had his coffee.