| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Undefined | 9 | 5 | 4 | 3 |
| Undestroyable | 13 | 8 | 5 | 4 |
| Undifferentiated | 16 | 9 | 7 | 6 |
| Undiminished | 12 | 7 | 5 | 4 |
| Undying | 7 | 5 | 2 | 3 |
| Unending | 8 | 5 | 3 | 3 |
| Unfaltering | 11 | 7 | 4 | 4 |
| Unfathomable | 12 | 7 | 5 | 5 |
| Unfathomed | 10 | 6 | 4 | 3 |
| Uniform | 7 | 4 | 3 | 3 |
| Unintermitted | 13 | 8 | 5 | 5 |
| Unintermittent | 14 | 9 | 5 | 5 |
| Unintermitting | 14 | 9 | 5 | 5 |
| Uninterrupted | 13 | 8 | 5 | 5 |
| Universal | 9 | 5 | 4 | 4 |
| Universal Joint | 15 | 9 | 6 | 5 |
| Unlimited | 9 | 5 | 4 | 4 |
| Unmeasurable | 12 | 6 | 6 | 5 |
| Unmeasured | 10 | 5 | 5 | 3 |
| Unnumberable | 12 | 7 | 5 | 5 |
| Unnumbered | 10 | 6 | 4 | 3 |
| Unnumerable | 11 | 6 | 5 | 5 |
| Unplumbed | 9 | 6 | 3 | 3 |
| Unrelenting | 11 | 7 | 4 | 4 |
| Unrelieved | 10 | 5 | 5 | 3 |
| Unremitting | 11 | 7 | 4 | 4 |
| Unshakable | 10 | 6 | 4 | 4 |
| Unsounded | 9 | 5 | 4 | 3 |
| Unstopped | 9 | 6 | 3 | 2 |
| Untold | 6 | 4 | 2 | 2 |
| Unvarying | 9 | 6 | 3 | 4 |
| Unwavering | 10 | 6 | 4 | 4 |
| Vague | 5 | 2 | 3 | 1 |
| Vast | 4 | 3 | 1 | 1 |
| Voluminous | 10 | 5 | 5 | 4 |

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