| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Baseless | 8 | 5 | 3 | 2 |
| Bootless | 8 | 5 | 3 | 2 |
| Controvertible | 14 | 9 | 5 | 5 |
| Empty | 5 | 4 | 1 | 2 |
| Fruitless | 9 | 6 | 3 | 2 |
| Futile | 6 | 3 | 3 | 2 |
| Groundless | 10 | 7 | 3 | 2 |
| Idle | 4 | 2 | 2 | 2 |
| Ill Founded | 11 | 7 | 4 | 3 |
| Indefensible | 12 | 7 | 5 | 5 |
| Insupportable | 13 | 8 | 5 | 5 |
| Intolerable | 11 | 6 | 5 | 5 |
| Sleeveless | 10 | 6 | 4 | 2 |
| Tick Over | 9 | 6 | 3 | 3 |
| Unattestable | 12 | 7 | 5 | 5 |
| Unbased | 7 | 4 | 3 | 2 |
| Unbearable | 10 | 5 | 5 | 4 |
| Unconfirmable | 13 | 8 | 5 | 5 |
| Undemonstrable | 14 | 9 | 5 | 5 |
| Undemonstratable | 16 | 10 | 6 | 6 |
| Unendurable | 11 | 6 | 5 | 5 |
| Unfounded | 9 | 5 | 4 | 3 |
| Ungrounded | 10 | 6 | 4 | 3 |
| Unjustifiable | 13 | 7 | 6 | 6 |
| Unobjective | 11 | 6 | 5 | 4 |
| Unprovable | 10 | 6 | 4 | 4 |
| Unsubstantiatable | 17 | 10 | 7 | 6 |
| Unsupported | 11 | 7 | 4 | 4 |
| Unsustainable | 13 | 7 | 6 | 5 |
| Unsustained | 11 | 6 | 5 | 3 |
| Untenable | 9 | 5 | 4 | 4 |
| Unverifiable | 12 | 6 | 6 | 6 |
| Unwarrantable | 13 | 8 | 5 | 5 |
| Unwarranted | 11 | 7 | 4 | 4 |
| Vain | 4 | 2 | 2 | 1 |
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