| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Inexorableness | 14 | 8 | 6 | 6 |
| Infinite Duration | 17 | 9 | 8 | 7 |
| Infinity | 8 | 5 | 3 | 4 |
| Inflexibility | 13 | 8 | 5 | 6 |
| Insistence | 10 | 6 | 4 | 3 |
| Insistency | 10 | 7 | 3 | 4 |
| Instancy | 8 | 6 | 2 | 3 |
| Intentness | 10 | 7 | 3 | 3 |
| Interminability | 15 | 9 | 6 | 7 |
| Invariability | 13 | 7 | 6 | 7 |
| Invariableness | 14 | 8 | 6 | 6 |
| Invariance | 10 | 5 | 5 | 4 |
| Inveteracy | 10 | 6 | 4 | 5 |
| Invincibility | 13 | 8 | 5 | 6 |
| Irritability | 12 | 7 | 5 | 6 |
| Jointlessness | 13 | 9 | 4 | 3 |
| Judiciousness | 13 | 7 | 6 | 4 |
| Juste Milieu | 12 | 6 | 6 | 5 |
| Labyrinthine Sense | 18 | 12 | 6 | 7 |
| Lastingness | 11 | 8 | 3 | 3 |
| Legitimacy | 10 | 6 | 4 | 5 |
| Length | 6 | 5 | 1 | 1 |
| Lenience | 8 | 4 | 4 | 3 |
| Leniency | 8 | 5 | 3 | 4 |
| Lenity | 6 | 4 | 2 | 3 |
| Link | 4 | 3 | 1 | 1 |
| Linkup | 6 | 4 | 2 | 2 |
| Listlessness | 12 | 9 | 3 | 3 |
| Longevity | 9 | 6 | 3 | 4 |
| Long Lastingness | 16 | 12 | 4 | 4 |
| Long Livedness | 14 | 10 | 4 | 4 |
| Long Standing | 13 | 10 | 3 | 3 |
| Loyalty | 7 | 5 | 2 | 2 |
| Maintenance | 11 | 6 | 5 | 3 |
| Manufacture | 11 | 6 | 5 | 4 |

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