Or search: unclear, illegible, unreadable, indecipherable
3 Syllables: SUU
admirable, favorable, miserable, preferable
4 Syllables: SUUU
answerable, favourable, honorable, honourable, measurable, memorable, pleasurable, separable, tolerable, venerable, vulnerable
4 Syllables: USUU
desirable, discoverable, inviolable
5 Syllables: USUUU
considerable, dishonorable, dishonourable, incomparable, inexorable, innumerable, inseparable, insufferable, insuperable, intolerable, invulnerable, irreparable, recoverable, unalterable, unanswerable, unconquerable, unfavorable, unfavourable, unutterable
5 Syllables: UUSUU
undesirable
6 Syllables: UUSUUU
inconsiderable, unendurable

Found 40 words across 6 groupings.