| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Unambiguous | 11 | 5 | 6 | 5 |
| Unbound | 7 | 4 | 3 | 2 |
| Unbounded | 9 | 5 | 4 | 3 |
| Unbridled | 9 | 6 | 3 | 3 |
| Unchecked | 9 | 6 | 3 | 2 |
| Uncoerced | 9 | 5 | 4 | 2 |
| Uncompelled | 11 | 7 | 4 | 4 |
| Uncomprehensible | 16 | 10 | 6 | 6 |
| Unconditional | 13 | 7 | 6 | 5 |
| Unconditioned | 13 | 7 | 6 | 4 |
| Unconfined | 10 | 6 | 4 | 3 |
| Unconstrained | 13 | 8 | 5 | 3 |
| Uncontrollable | 14 | 9 | 5 | 5 |
| Uncontrolled | 12 | 8 | 4 | 4 |
| Uncountable | 11 | 6 | 5 | 4 |
| Uncounted | 9 | 5 | 4 | 3 |
| Uncurbed | 8 | 5 | 3 | 3 |
| Undisciplined | 13 | 8 | 5 | 4 |
| Undue | 5 | 2 | 3 | 2 |
| Unequivocal | 11 | 5 | 6 | 5 |
| Unfathomable | 12 | 7 | 5 | 5 |
| Unfathomed | 10 | 6 | 4 | 3 |
| Unforced | 8 | 5 | 3 | 2 |
| Unfrugal | 8 | 5 | 3 | 3 |
| Ungovernable | 12 | 7 | 5 | 5 |
| Ungoverned | 10 | 6 | 4 | 3 |
| Uninhibited | 11 | 6 | 5 | 5 |
| Universal | 9 | 5 | 4 | 4 |
| Universal Joint | 15 | 9 | 6 | 5 |
| Univocal | 8 | 4 | 4 | 4 |
| Unlimited | 9 | 5 | 4 | 4 |
| Unmastered | 10 | 6 | 4 | 3 |
| Unmeasurable | 12 | 6 | 6 | 5 |
| Unmeasured | 10 | 5 | 5 | 3 |
| Unmuzzled | 9 | 6 | 3 | 3 |

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