| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Absolute | 8 | 4 | 4 | 3 |
| Assure | 6 | 3 | 3 | 2 |
| Bulletproof | 11 | 7 | 4 | 3 |
| Condom | 6 | 4 | 2 | 2 |
| Consuming | 9 | 6 | 3 | 3 |
| Deathless | 9 | 6 | 3 | 2 |
| Defended | 8 | 5 | 3 | 3 |
| Deity | 5 | 3 | 2 | 2 |
| Divinity | 8 | 5 | 3 | 4 |
| Ensure | 6 | 3 | 3 | 2 |
| Flinty | 6 | 5 | 1 | 2 |
| God | 3 | 2 | 1 | 1 |
| Granitic | 8 | 5 | 3 | 3 |
| Guarantee | 9 | 4 | 5 | 3 |
| Guarded | 7 | 4 | 3 | 2 |
| Immortal | 8 | 5 | 3 | 3 |
| Impenetrable | 12 | 7 | 5 | 5 |
| Imperishable | 12 | 7 | 5 | 5 |
| Impregnable | 11 | 7 | 4 | 4 |
| Incontestable | 13 | 8 | 5 | 5 |
| Incontestible | 13 | 8 | 5 | 5 |
| Incorruptible | 13 | 8 | 5 | 5 |
| Indelible | 9 | 5 | 4 | 4 |
| Indestructible | 14 | 9 | 5 | 5 |
| Indomitable | 11 | 6 | 5 | 5 |
| Ineffaceable | 12 | 6 | 6 | 5 |
| Ineradicable | 12 | 6 | 6 | 6 |
| Inexpugnable | 12 | 7 | 5 | 5 |
| Inextinguishable | 16 | 9 | 7 | 6 |
| Infrangible | 11 | 7 | 4 | 4 |
| Insuperable | 11 | 6 | 5 | 5 |
| Insure | 6 | 3 | 3 | 2 |
| Insurmountable | 14 | 8 | 6 | 5 |
| Invincible | 10 | 6 | 4 | 4 |
| Inviolable | 10 | 5 | 5 | 5 |
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