Or search: irreproducible, unreproducible
3 Syllables: SUU
miserable
4 Syllables: SUUU
charitable, creditable, equitable, habitable, irritable, marketable, palatable, profitable, reputable
5 Syllables: USUUU
attributable, considerable, disreputable, indomitable, inequitable, inevitable, unpalatable
6 Syllables: UUSUUU
inconsiderable, uninhabitable

Found 19 words across 4 groupings.