| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Absolute | 8 | 4 | 4 | 3 |
| Actual | 6 | 3 | 3 | 3 |
| Admitting No Question | 21 | 13 | 8 | 6 |
| Beyond Doubtp | 13 | 9 | 4 | 2 |
| Confirmable | 11 | 7 | 4 | 4 |
| Demonstrable | 12 | 8 | 4 | 4 |
| Demonstratable | 14 | 9 | 5 | 5 |
| Existent | 8 | 5 | 3 | 3 |
| Factual | 7 | 4 | 3 | 3 |
| Falsifiable | 11 | 6 | 5 | 5 |
| Historic | 8 | 5 | 3 | 3 |
| Historical | 10 | 6 | 4 | 4 |
| Inappealable | 12 | 6 | 6 | 5 |
| Incontestable | 13 | 8 | 5 | 5 |
| Incontestible | 13 | 8 | 5 | 5 |
| Incontrovertible | 16 | 10 | 6 | 6 |
| Indubitable | 11 | 6 | 5 | 5 |
| Irrefragable | 12 | 7 | 5 | 5 |
| Irrefutable | 11 | 6 | 5 | 5 |
| Positive | 8 | 4 | 4 | 3 |
| Provable | 8 | 5 | 3 | 3 |
| Real | 4 | 2 | 2 | 1 |
| Self Evident | 12 | 8 | 4 | 4 |
| Sure | 4 | 2 | 2 | 1 |
| Testable | 8 | 5 | 3 | 3 |
| Unanswerable | 12 | 7 | 5 | 5 |
| Unanswered | 10 | 6 | 4 | 3 |
| Unconfutable | 12 | 7 | 5 | 5 |
| Unconfuted | 10 | 6 | 4 | 4 |
| Uncontradicted | 14 | 9 | 5 | 5 |
| Uncontroverted | 14 | 9 | 5 | 5 |
| Undeniable | 10 | 5 | 5 | 5 |
| Undenied | 8 | 4 | 4 | 3 |
| Unexceptionable | 15 | 8 | 7 | 6 |
| Unimpeachable | 13 | 7 | 6 | 5 |
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