| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Undependableness | 16 | 10 | 6 | 6 |
| Undeterminedness | 16 | 10 | 6 | 6 |
| Uneasiness | 10 | 5 | 5 | 4 |
| Unevenness | 10 | 6 | 4 | 4 |
| Unfaithworthiness | 17 | 11 | 6 | 5 |
| Unfirmness | 10 | 7 | 3 | 3 |
| Unfixedness | 11 | 7 | 4 | 4 |
| Unhealthiness | 13 | 8 | 5 | 4 |
| Unorthodoxy | 11 | 7 | 4 | 5 |
| Unpredictability | 16 | 10 | 6 | 7 |
| Unreliability | 13 | 7 | 6 | 7 |
| Unreliableness | 14 | 8 | 6 | 6 |
| Unsafeness | 10 | 6 | 4 | 4 |
| Unsettledness | 13 | 9 | 4 | 4 |
| Unsettlement | 12 | 8 | 4 | 4 |
| Unsolidity | 10 | 6 | 4 | 5 |
| Unsoundness | 11 | 7 | 4 | 3 |
| Unstableness | 12 | 8 | 4 | 4 |
| Unsteadfastness | 15 | 10 | 5 | 4 |
| Unsteadiness | 12 | 7 | 5 | 4 |
| Unsubstantiality | 16 | 10 | 6 | 6 |
| Unsureness | 10 | 6 | 4 | 4 |
| Untrustiness | 12 | 8 | 4 | 4 |
| Untrustworthiness | 17 | 12 | 5 | 5 |
| Vapidity | 8 | 5 | 3 | 4 |
| Vapidness | 9 | 6 | 3 | 3 |
| Variability | 11 | 6 | 5 | 6 |
| Variableness | 12 | 7 | 5 | 5 |
| Variance | 8 | 4 | 4 | 3 |
| Variation | 9 | 4 | 5 | 4 |
| Variegation | 11 | 5 | 6 | 4 |
| Variety | 7 | 4 | 3 | 5 |
| Variousness | 11 | 6 | 5 | 4 |
| Versatility | 11 | 7 | 4 | 5 |
| Volatility | 10 | 6 | 4 | 5 |

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