Or search: abysmal, limitless, unmeasured, illimitable, measureless
3 Syllables: SUU
admirable, favorable, miserable, preferable
4 Syllables: SUUU
answerable, charitable, creditable, eligible, equitable, estimable, favourable, honorable, honourable, measurable, memorable, negligible, pleasurable, separable, tolerable, venerable, vulnerable
4 Syllables: USUU
desirable, discoverable
5 Syllables: USUUU
considerable, dishonorable, dishonourable, impenetrable, impressionable, incomparable, inequitable, inestimable, inevitable, inexorable, innumerable, inseparable, insufferable, insuperable, intelligible, intolerable, invulnerable, irrefragable, irreparable, irrevocable, recoverable, unalterable, unanswerable, unconquerable, unfavorable, unfavourable, unutterable
5 Syllables: UUSUU
undesirable
6 Syllables: UUSUUU
inconsiderable, unendurable, unintelligible

Found 54 words across 6 groupings.