| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Remarkable | 10 | 6 | 4 | 4 |
| Riddling | 8 | 6 | 2 | 2 |
| Sealed | 6 | 3 | 3 | 1 |
| Secret | 6 | 4 | 2 | 2 |
| Self Contradictory | 18 | 13 | 5 | 6 |
| Sensational | 11 | 6 | 5 | 4 |
| Singular | 8 | 5 | 3 | 3 |
| Special | 7 | 4 | 3 | 2 |
| Sphinxlike | 10 | 7 | 3 | 2 |
| Sticky | 6 | 5 | 1 | 2 |
| Strange | 7 | 5 | 2 | 2 |
| Striking | 8 | 6 | 2 | 2 |
| Stunning | 8 | 6 | 2 | 2 |
| Stupefying | 10 | 7 | 3 | 4 |
| Stupendous | 10 | 6 | 4 | 3 |
| Talla | 5 | 3 | 2 | 2 |
| Tangled | 7 | 5 | 2 | 2 |
| Terrific | 8 | 5 | 3 | 3 |
| Tortuous | 8 | 4 | 4 | 3 |
| Tremendous | 10 | 6 | 4 | 3 |
| Troubling | 9 | 6 | 3 | 2 |
| Twisted | 7 | 5 | 2 | 2 |
| Unapparent | 10 | 6 | 4 | 4 |
| Unapprehended | 13 | 8 | 5 | 5 |
| Unascertainable | 15 | 8 | 7 | 6 |
| Unascertained | 13 | 7 | 6 | 4 |
| Unbeknown | 9 | 6 | 3 | 3 |
| Unbeknownst | 11 | 8 | 3 | 3 |
| Unbelievable | 12 | 6 | 6 | 5 |
| Uncharted | 9 | 6 | 3 | 3 |
| Uncomprehensible | 16 | 10 | 6 | 6 |
| Undisclosed | 11 | 7 | 4 | 3 |
| Undiscoverable | 14 | 8 | 6 | 6 |
| Undiscovered | 12 | 7 | 5 | 4 |
| Undivulged | 10 | 6 | 4 | 4 |

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