| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Abiding | 7 | 4 | 3 | 3 |
| Amaranthine | 11 | 6 | 5 | 4 |
| Business Firm | 13 | 9 | 4 | 4 |
| Ceaseless | 9 | 5 | 4 | 2 |
| Changeless | 10 | 7 | 3 | 2 |
| Constant | 8 | 6 | 2 | 2 |
| Continuing | 10 | 6 | 4 | 4 |
| Durable | 7 | 4 | 3 | 3 |
| Endless | 7 | 5 | 2 | 2 |
| Enduring | 8 | 5 | 3 | 3 |
| Entire | 6 | 3 | 3 | 2 |
| Fast | 4 | 3 | 1 | 1 |
| Firm | 4 | 3 | 1 | 1 |
| Fixed | 5 | 3 | 2 | 2 |
| Free Burning | 12 | 8 | 4 | 3 |
| Frozen | 6 | 4 | 2 | 2 |
| Horse Barn | 10 | 7 | 3 | 3 |
| House | 5 | 2 | 3 | 1 |
| Immobile | 8 | 4 | 4 | 3 |
| Immutable | 9 | 5 | 4 | 4 |
| Imperishable | 12 | 7 | 5 | 5 |
| Incessant | 9 | 6 | 3 | 3 |
| Incommutable | 12 | 7 | 5 | 5 |
| Inconvertible | 13 | 8 | 5 | 5 |
| Indefeasible | 12 | 6 | 6 | 5 |
| Inert | 5 | 3 | 2 | 2 |
| Insusceptible | 13 | 8 | 5 | 5 |
| Insusceptible Of Change | 23 | 15 | 8 | 7 |
| Intact | 6 | 4 | 2 | 2 |
| Integral | 8 | 5 | 3 | 3 |
| Invariable | 10 | 5 | 5 | 5 |
| Inviolate | 9 | 4 | 5 | 4 |
| Irretrievable | 13 | 7 | 6 | 5 |
| Irreversible | 12 | 7 | 5 | 5 |
| Irrevocable | 11 | 6 | 5 | 5 |

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