| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Apocryphal | 10 | 7 | 3 | 3 |
| Baseless | 8 | 5 | 3 | 2 |
| Groundless | 10 | 7 | 3 | 2 |
| Idle | 4 | 2 | 2 | 2 |
| Inauthentic | 11 | 6 | 5 | 4 |
| Inconclusive | 12 | 7 | 5 | 4 |
| Indecisive | 10 | 5 | 5 | 4 |
| Indefensible | 12 | 7 | 5 | 5 |
| Indeterminate | 13 | 7 | 6 | 5 |
| Insupportable | 13 | 8 | 5 | 5 |
| Nebulous | 8 | 4 | 4 | 3 |
| Nonofficial | 11 | 6 | 5 | 4 |
| Not Following | 13 | 9 | 4 | 4 |
| Not Proved | 10 | 7 | 3 | 2 |
| Spurious | 8 | 4 | 4 | 3 |
| Unascertained | 13 | 7 | 6 | 4 |
| Unattested | 10 | 6 | 4 | 4 |
| Unauthentic | 11 | 6 | 5 | 4 |
| Unauthenticated | 15 | 8 | 7 | 6 |
| Unauthoritative | 15 | 7 | 8 | 6 |
| Unbridled | 9 | 6 | 3 | 3 |
| Unchecked | 9 | 6 | 3 | 2 |
| Unconfirmed | 11 | 7 | 4 | 3 |
| Uncorroborated | 14 | 8 | 6 | 6 |
| Uncurbed | 8 | 5 | 3 | 3 |
| Undemonstrated | 14 | 9 | 5 | 5 |
| Undetermined | 12 | 7 | 5 | 4 |
| Unestablished | 13 | 8 | 5 | 4 |
| Unfixed | 7 | 4 | 3 | 3 |
| Unfounded | 9 | 5 | 4 | 3 |
| Ungoverned | 10 | 6 | 4 | 3 |
| Unjustifiable | 13 | 7 | 6 | 6 |
| Unofficial | 10 | 5 | 5 | 4 |
| Unproved | 8 | 5 | 3 | 2 |
| Unproven | 8 | 5 | 3 | 3 |
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