| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Formidability | 13 | 8 | 5 | 6 |
| Frozenness | 10 | 7 | 3 | 3 |
| Glueyness | 9 | 6 | 3 | 2 |
| Gluiness | 8 | 5 | 3 | 2 |
| Gumminess | 9 | 6 | 3 | 3 |
| Hardening | 9 | 6 | 3 | 3 |
| Hardiness | 9 | 6 | 3 | 3 |
| Hardness | 8 | 6 | 2 | 2 |
| Harshness | 9 | 7 | 2 | 2 |
| Immobility | 10 | 6 | 4 | 5 |
| Immovability | 12 | 7 | 5 | 6 |
| Immovableness | 13 | 8 | 5 | 5 |
| Immutability | 12 | 7 | 5 | 6 |
| Immutableness | 13 | 8 | 5 | 5 |
| Incessancy | 10 | 7 | 3 | 4 |
| Incessantness | 13 | 9 | 4 | 4 |
| Inclemency | 10 | 7 | 3 | 4 |
| Indestructibility | 17 | 11 | 6 | 7 |
| Infinite Duration | 17 | 9 | 8 | 7 |
| Infinity | 8 | 5 | 3 | 4 |
| Inflexibility | 13 | 8 | 5 | 6 |
| Infrangibility | 14 | 9 | 5 | 6 |
| 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 |
| Lastingness | 11 | 8 | 3 | 3 |
| Leatherlikeness | 15 | 9 | 6 | 5 |
| Length | 6 | 5 | 1 | 1 |
| Listlessness | 12 | 9 | 3 | 3 |
| Long Standing | 13 | 10 | 3 | 3 |
| Lustiness | 9 | 6 | 3 | 3 |
| Materiality | 11 | 6 | 5 | 6 |
| Matter | 6 | 4 | 2 | 2 |

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