| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Imperative | 10 | 5 | 5 | 4 |
| Impertinent | 11 | 7 | 4 | 4 |
| Impolite | 8 | 4 | 4 | 3 |
| Imposing | 8 | 5 | 3 | 3 |
| Improvident | 11 | 7 | 4 | 4 |
| Imprudent | 9 | 6 | 3 | 3 |
| Impudent | 8 | 5 | 3 | 3 |
| Inaffable | 9 | 5 | 4 | 4 |
| Incautious | 10 | 4 | 6 | 4 |
| Indecent | 8 | 5 | 3 | 3 |
| Indecorous | 10 | 5 | 5 | 4 |
| Indefinable | 11 | 6 | 5 | 5 |
| Indelicate | 10 | 5 | 5 | 4 |
| Indescribable | 13 | 8 | 5 | 5 |
| Indiscreet | 10 | 6 | 4 | 3 |
| Indurated | 9 | 5 | 4 | 4 |
| Ineffable | 9 | 5 | 4 | 4 |
| Infamous | 8 | 4 | 4 | 3 |
| Inharmonic | 10 | 6 | 4 | 4 |
| Injudicious | 11 | 5 | 6 | 4 |
| Insistent | 9 | 6 | 3 | 3 |
| Insolent | 8 | 5 | 3 | 3 |
| Instant | 7 | 5 | 2 | 2 |
| Insubordinate | 13 | 7 | 6 | 5 |
| Insult | 6 | 4 | 2 | 2 |
| Insulting | 9 | 6 | 3 | 3 |
| Inured | 6 | 3 | 3 | 2 |
| Iron | 4 | 2 | 2 | 2 |
| Ironlike | 8 | 4 | 4 | 3 |
| Irreverent | 10 | 6 | 4 | 4 |
| Jazzy | 5 | 4 | 1 | 2 |
| Jeering | 7 | 4 | 3 | 2 |
| Knavish | 7 | 5 | 2 | 2 |
| Knit | 4 | 3 | 1 | 1 |
| Lead | 4 | 2 | 2 | 1 |

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