Or search: awful, odious, hateful, dreadful, atrocious, execrable, detestable, unspeakable
3 Syllables: SUU
fashionable, reasonable
4 Syllables: SUUU
honorable, honourable, knowledgeable, pardonable, profitable, questionable, seasonable, tolerable, treasonable
5 Syllables: USUUU
companionable, determinable, dishonorable, dishonourable, imaginable, impressionable, inalienable, incorrigible, indomitable, interminable, intolerable, objectionable, unfashionable, unpardonable, unquestionable, unseasonable
6 Syllables: UUSUUU
unexceptionable

Found 28 words across 4 groupings.