| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Heteromorphic | 13 | 8 | 5 | 5 |
| Hotheaded | 9 | 5 | 4 | 3 |
| Hour | 4 | 2 | 2 | 1 |
| Human | 5 | 3 | 2 | 2 |
| Idiocratic | 10 | 5 | 5 | 5 |
| Idiosyncratic | 13 | 8 | 5 | 6 |
| Impetuous | 9 | 4 | 5 | 4 |
| Impulsive | 9 | 5 | 4 | 3 |
| Inaccordant | 11 | 7 | 4 | 4 |
| Incompatible | 12 | 7 | 5 | 5 |
| Incongruous | 11 | 6 | 5 | 4 |
| Inconsistent | 12 | 8 | 4 | 4 |
| Inconsonant | 11 | 7 | 4 | 4 |
| Inconstant | 10 | 7 | 3 | 3 |
| Individual | 10 | 5 | 5 | 5 |
| Infatuated | 10 | 5 | 5 | 5 |
| Inharmonic | 10 | 6 | 4 | 4 |
| Inharmonious | 12 | 6 | 6 | 5 |
| Inhomogeneous | 13 | 6 | 7 | 6 |
| Inner | 5 | 3 | 2 | 2 |
| Intimate | 8 | 4 | 4 | 3 |
| In Disagreement | 15 | 9 | 6 | 5 |
| In Love | 7 | 4 | 3 | 2 |
| Irreconcilable | 14 | 8 | 6 | 6 |
| Irregular | 9 | 5 | 4 | 4 |
| Irritable | 9 | 5 | 4 | 4 |
| Jagged | 6 | 4 | 2 | 1 |
| Jaggy | 5 | 4 | 1 | 2 |
| Jerked Meat | 11 | 7 | 4 | 3 |
| Jerky | 5 | 4 | 1 | 2 |
| Kookie | 6 | 2 | 4 | 2 |
| Kooky | 5 | 3 | 2 | 2 |
| Loco | 4 | 2 | 2 | 2 |
| Loony | 5 | 3 | 2 | 2 |
| Loopy | 5 | 3 | 2 | 2 |

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