| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Incommutable | 12 | 7 | 5 | 5 |
| Inconvertible | 13 | 8 | 5 | 5 |
| Indefatigable | 13 | 7 | 6 | 6 |
| Indefeasible | 12 | 6 | 6 | 5 |
| Indelible | 9 | 5 | 4 | 4 |
| Indestructible | 14 | 9 | 5 | 5 |
| Indissoluble | 12 | 7 | 5 | 5 |
| Indomitable | 11 | 6 | 5 | 5 |
| Industrious | 11 | 6 | 5 | 4 |
| Inert | 5 | 3 | 2 | 2 |
| Inexorable | 10 | 5 | 5 | 5 |
| Insistent | 9 | 6 | 3 | 3 |
| Insusceptible | 13 | 8 | 5 | 5 |
| Insusceptible Of Change | 23 | 15 | 8 | 7 |
| Intact | 6 | 4 | 2 | 2 |
| Integral | 8 | 5 | 3 | 3 |
| Intense | 7 | 4 | 3 | 3 |
| Intent | 6 | 4 | 2 | 2 |
| Interminable | 12 | 7 | 5 | 5 |
| Intransient | 11 | 7 | 4 | 4 |
| Intransigent | 12 | 8 | 4 | 4 |
| Invariable | 10 | 5 | 5 | 5 |
| Inveterate | 10 | 5 | 5 | 4 |
| Invincible | 10 | 6 | 4 | 4 |
| Inviolate | 9 | 4 | 5 | 4 |
| Irretrievable | 13 | 7 | 6 | 5 |
| Irreversible | 12 | 7 | 5 | 5 |
| Irrevocable | 11 | 6 | 5 | 5 |
| Irrevokable | 11 | 6 | 5 | 5 |
| Jet | 3 | 2 | 1 | 1 |
| Kept In Remembrance | 19 | 13 | 6 | 5 |
| Languishing | 11 | 7 | 4 | 3 |
| Lasting | 7 | 5 | 2 | 2 |
| Leathered | 9 | 5 | 4 | 2 |
| Leatherlike | 11 | 6 | 5 | 3 |

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