12 letters
- technobabble28
- tenabilities17
- thermolabile22
- thermostable21
- thingamabobs26
- throttleable19
- tolerability19
- traceability21
- tractability21
- trainability19
- transferable20
- transfusable21
- translatable18
- transmutable21
- transposable20
- treatability18
- trisyllables20
- trustability19
- tunabilities18
- unacceptable27
- unacceptably29
- unaffordable25
- unanalyzable31
- unanswerable22
- unanswerably24
- unappealable25
- unappeasable24
- unappeasably26
- unassailable19
- unassailably21
- unattainable19
- unbelievable26
- unbelievably28
- unbreachable26
- unbreathable23
- unbridgeable24
- uncapturable25
- unchangeable26
- unchangeably28
- uncharitable23
- uncharitably25
- uncultivable27
- undependable24
- undesirables19
- undetectable22
- undisputable23
- unemployable27
- unfathomable26
- unforgivable27
- ungovernable25
- unimaginable24
- unimaginably26
- unlistenable20
- unmanageable24
- unmanageably26
- unmarketable25
- unmeasurable22
- unmistakable25
- unmistakably27
- unmodifiable25
- unnegotiable21
- unnoticeable22
- unobservable25
- unobtainable22
- unpardonable23
- unpatentable22
- unprofitable24
- unprofitably26
- unquenchable34
- unrealizable28
- unreasonable19
- unreasonably21
- unrecyclable27
- unredeemable22
- unremarkable25
- unremarkably27
- unrepeatable21
- unresolvable23
- unreturnable20
- unreviewable25
- unsearchable23
- unsearchably25
- unseasonable19
- unseasonably21
- unstableness19
- untenability21
- untouchables24
- unverifiable25
- usablenesses18
- vagabondages25
- vagabondisms26
- valuableness23
- vanquishable33
- variableness21
- venerability23
- violableness22
- vocabularies24
- voidableness22
- withdrawable25
- workableness24