| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Ceaseless | 9 | 5 | 4 | 2 |
| Changeless | 10 | 7 | 3 | 2 |
| Constant | 8 | 6 | 2 | 2 |
| Durable | 7 | 4 | 3 | 3 |
| Immutable | 9 | 5 | 4 | 4 |
| 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 |
| Invariable | 10 | 5 | 5 | 5 |
| Irretrievable | 13 | 7 | 6 | 5 |
| Irreversible | 12 | 7 | 5 | 5 |
| Irrevocable | 11 | 6 | 5 | 5 |
| Irrevokable | 11 | 6 | 5 | 5 |
| Lasting | 7 | 5 | 2 | 2 |
| Long Lasting | 12 | 9 | 3 | 3 |
| Long Lived | 10 | 7 | 3 | 2 |
| Lord | 4 | 3 | 1 | 1 |
| Never Ending | 12 | 8 | 4 | 4 |
| Noble | 5 | 3 | 2 | 2 |
| Nobleman | 8 | 5 | 3 | 3 |
| Nonreturnable | 13 | 8 | 5 | 5 |
| Nonreversible | 13 | 8 | 5 | 5 |
| One Sided | 9 | 5 | 4 | 4 |
| Perm | 4 | 3 | 1 | 1 |
| Permanent | 9 | 6 | 3 | 3 |
| Permanent Wave | 14 | 9 | 5 | 4 |
| Perpetual | 9 | 5 | 4 | 4 |
| Reverseless | 11 | 7 | 4 | 3 |
| Sluggish | 8 | 6 | 2 | 2 |
| Stable | 6 | 4 | 2 | 2 |
| Static | 6 | 4 | 2 | 2 |
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