| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Suppressed | 10 | 7 | 3 | 1 |
| Talla | 5 | 3 | 2 | 2 |
| Terrible | 8 | 5 | 3 | 3 |
| Terrific | 8 | 5 | 3 | 3 |
| Tongueless | 10 | 6 | 4 | 2 |
| Top Secret | 10 | 7 | 3 | 3 |
| Tremendous | 10 | 6 | 4 | 3 |
| Ulterior | 8 | 4 | 4 | 4 |
| Unbelievable | 12 | 6 | 6 | 5 |
| Unbreatheable | 13 | 7 | 6 | 4 |
| Undefinable | 11 | 6 | 5 | 5 |
| Under Security | 14 | 9 | 5 | 6 |
| Under Wraps | 11 | 8 | 3 | 3 |
| Undisclosable | 13 | 8 | 5 | 5 |
| Undisclosed | 11 | 7 | 4 | 3 |
| Undivulgable | 12 | 7 | 5 | 5 |
| Undivulged | 10 | 6 | 4 | 4 |
| Unexpressed | 11 | 7 | 4 | 2 |
| Unexpressible | 13 | 8 | 5 | 5 |
| Unimaginable | 12 | 6 | 6 | 6 |
| Unmentionable | 13 | 7 | 6 | 5 |
| Unnameable | 10 | 5 | 5 | 4 |
| Unrevealable | 12 | 6 | 6 | 5 |
| Unrevealed | 10 | 5 | 5 | 3 |
| Unsaid | 6 | 3 | 3 | 2 |
| Unspeakable | 11 | 6 | 5 | 4 |
| Unspoken | 8 | 5 | 3 | 3 |
| Unstated | 8 | 5 | 3 | 3 |
| Untellable | 10 | 6 | 4 | 4 |
| Untold | 6 | 4 | 2 | 2 |
| Untouchable | 11 | 6 | 5 | 4 |
| Unutterable | 11 | 6 | 5 | 5 |
| Unuttered | 9 | 5 | 4 | 3 |
| Unverbalised | 12 | 7 | 5 | 4 |
| Unverbalized | 12 | 7 | 5 | 5 |

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