Synonyms of unbeautiful

1 Syllable
foul, plain, gross
2 Syllables
grisly, horrid, monstrous, ugliest, uglier, frightful, awful, hideous, ugly, beastly
3 Syllables
deformed, loathsome, grotesque, bad-looking, misshapen, repelling, appalling, unseemly, repugnant, unsightly, revolting, homely, animal
4 Syllables
unlovely, repulsive, hard-featured, ill-favored, uncomely, uninviting, disfigured
5 Syllables
unprepossessing