Or search: steep, usurious, exorbitant, outrageous, immoderate, extortionate, conscienceless, unconscientious
3 Syllables: SUU
fashionable, reasonable
4 Syllables: SUUU
pardonable, questionable, seasonable, treasonable
5 Syllables: USUUU
abominable, companionable, determinable, imaginable, impressionable, inalienable, incomparable, interminable, objectionable, unconquerable, unfashionable, unpardonable, unquestionable, unseasonable
6 Syllables: UUSUUU
unexceptionable

Found 21 words across 4 groupings.