Or search: vile, slimy, surly, awkward, hideous, alarming, horrible, unworthy, wretched, unlovely, atrocious, frightful, grotesque, monstrous, repulsive
2 Syllables: SU
bloodless, bulbous, buttress, Douglas, dullness, dulness, earliest, loveliest, luckless, luggage, spurious, troublous
3 Syllables: SUU
loveliness, ugliness
3 Syllables: USU
abruptness, deductive, illustrious, industrious, luxurious

Found 19 words across 3 groupings. Skipped 2 excess words of a similar stem.