Or search: impartial, evenhanded
3 Syllables: SUU
preferable
4 Syllables: SUUU
charitable, creditable, eligible, estimable, habitable, irritable, marketable, measurable, memorable, negligible, palatable, perishable, pleasurable, profitable, reputable, separable, venerable, veritable
5 Syllables: USUUU
attributable, discreditable, disreputable, illimitable, impenetrable, imperishable, impressionable, indomitable, indubitable, ineligible, inequitable, inestimable, inevitable, inextricable, inimitable, inseparable, intelligible, irrefragable, irreparable, irrevocable, uncharitable, unpalatable, unprofitable
5 Syllables: UUSUU
inhospitable
6 Syllables: UUSUUU
uninhabitable, unintelligible

Found 45 words across 5 groupings.