| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Able | 4 | 2 | 2 | 2 |
| Confusing | 9 | 6 | 3 | 3 |
| Enigmatic | 9 | 5 | 4 | 4 |
| Incalculable | 12 | 7 | 5 | 5 |
| Incognizable | 12 | 7 | 5 | 5 |
| Incognoscible | 13 | 8 | 5 | 5 |
| Mysterious | 10 | 6 | 4 | 4 |
| Mystic | 6 | 5 | 1 | 2 |
| Mystical | 8 | 6 | 2 | 3 |
| Nameless | 8 | 5 | 3 | 2 |
| Occult | 6 | 4 | 2 | 2 |
| Oracular | 8 | 4 | 4 | 4 |
| Orphic | 6 | 4 | 2 | 2 |
| Pathless | 8 | 6 | 2 | 2 |
| Perplexing | 10 | 7 | 3 | 3 |
| Profound | 8 | 5 | 3 | 2 |
| Puzzling | 8 | 6 | 2 | 2 |
| Roadless | 8 | 5 | 3 | 2 |
| Sealed | 6 | 3 | 3 | 1 |
| Secret | 6 | 4 | 2 | 2 |
| Strange | 7 | 5 | 2 | 2 |
| Trackless | 9 | 7 | 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 |
| Undisclosed | 11 | 7 | 4 | 3 |
| Undiscoverable | 14 | 8 | 6 | 6 |
| Undiscovered | 12 | 7 | 5 | 4 |
| Undivulged | 10 | 6 | 4 | 4 |
| Unexplained | 11 | 6 | 5 | 3 |
| Unexplored | 10 | 6 | 4 | 3 |
| Unexposed | 9 | 5 | 4 | 3 |
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