| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Stiff | 5 | 4 | 1 | 1 |
| Sustained | 9 | 5 | 4 | 2 |
| Torpid | 6 | 4 | 2 | 2 |
| Unalterable | 11 | 6 | 5 | 5 |
| Unalterative | 12 | 6 | 6 | 5 |
| Unaltered | 9 | 5 | 4 | 3 |
| Unbridled | 9 | 6 | 3 | 3 |
| Unceasing | 9 | 5 | 4 | 3 |
| Unchangeable | 12 | 7 | 5 | 4 |
| Unchanged | 9 | 6 | 3 | 3 |
| Unchanging | 10 | 7 | 3 | 3 |
| Unchecked | 9 | 6 | 3 | 2 |
| Uncurbed | 8 | 5 | 3 | 3 |
| Undeflectable | 13 | 8 | 5 | 5 |
| Undestroyed | 11 | 7 | 4 | 3 |
| Undeviating | 11 | 6 | 5 | 5 |
| Undiversified | 13 | 7 | 6 | 5 |
| Unexpended | 10 | 6 | 4 | 4 |
| Unfading | 8 | 5 | 3 | 3 |
| Unfailing | 9 | 5 | 4 | 3 |
| Unflagging | 10 | 7 | 3 | 3 |
| Ungoverned | 10 | 6 | 4 | 3 |
| Uniform | 7 | 4 | 3 | 3 |
| Unmodifiable | 12 | 6 | 6 | 6 |
| Unrelenting | 11 | 7 | 4 | 4 |
| Unremitting | 11 | 7 | 4 | 4 |
| Unrestorable | 12 | 7 | 5 | 5 |
| Unretrievable | 13 | 7 | 6 | 5 |
| Unreturnable | 12 | 7 | 5 | 5 |
| Unshifting | 10 | 7 | 3 | 3 |
| Unsusceptible | 13 | 8 | 5 | 5 |
| Unswerving | 10 | 7 | 3 | 3 |
| Unvariable | 10 | 5 | 5 | 5 |
| Unvaried | 8 | 4 | 4 | 3 |
| Unvarying | 9 | 6 | 3 | 4 |

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