| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Hardening | 9 | 6 | 3 | 3 |
| Hardheadedness | 14 | 9 | 5 | 4 |
| Harmoniousness | 14 | 8 | 6 | 5 |
| Headstrongness | 14 | 10 | 4 | 3 |
| Holding | 7 | 5 | 2 | 2 |
| Homogeneity | 11 | 6 | 5 | 5 |
| Homogeneousness | 15 | 8 | 7 | 6 |
| 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 |
| Imperativeness | 14 | 8 | 6 | 6 |
| Importunacy | 11 | 7 | 4 | 5 |
| Importunateness | 15 | 9 | 6 | 6 |
| Importunity | 11 | 7 | 4 | 5 |
| Indefatigability | 16 | 9 | 7 | 8 |
| Indefatigableness | 17 | 10 | 7 | 7 |
| Indulgence | 10 | 6 | 4 | 3 |
| Industriousness | 15 | 9 | 6 | 5 |
| Industry | 8 | 6 | 2 | 3 |
| Inexorability | 13 | 7 | 6 | 7 |
| Inexorableness | 14 | 8 | 6 | 6 |
| Inflexibility | 13 | 8 | 5 | 6 |
| Inflexible Will | 15 | 10 | 5 | 5 |
| Insistence | 10 | 6 | 4 | 3 |
| Insistency | 10 | 7 | 3 | 4 |
| Instancy | 8 | 6 | 2 | 3 |
| Intentness | 10 | 7 | 3 | 3 |
| Intolerance | 11 | 6 | 5 | 4 |
| Invariability | 13 | 7 | 6 | 7 |
| Invariableness | 14 | 8 | 6 | 6 |
| Invariance | 10 | 5 | 5 | 4 |
| Inveteracy | 10 | 6 | 4 | 5 |
| Keeping | 7 | 4 | 3 | 2 |

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