| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Immorality | 10 | 6 | 4 | 5 |
| Impious | 7 | 3 | 4 | 3 |
| Impish | 6 | 4 | 2 | 2 |
| Implike | 7 | 4 | 3 | 2 |
| Infernal | 8 | 5 | 3 | 3 |
| Inhuman | 7 | 4 | 3 | 3 |
| Inhumane | 8 | 4 | 4 | 3 |
| Iniquitous | 10 | 4 | 6 | 4 |
| Iniquity | 8 | 4 | 4 | 4 |
| Irruptive | 9 | 5 | 4 | 3 |
| Knavish | 7 | 5 | 2 | 2 |
| Lethean | 7 | 4 | 3 | 2 |
| Looney | 6 | 3 | 3 | 2 |
| Loony | 5 | 3 | 2 | 2 |
| Lower | 5 | 3 | 2 | 2 |
| Lunatic | 7 | 4 | 3 | 3 |
| Madcap | 6 | 4 | 2 | 2 |
| Maledict | 8 | 5 | 3 | 3 |
| Malefic | 7 | 4 | 3 | 3 |
| Maleficent | 10 | 6 | 4 | 4 |
| Malevolent | 10 | 6 | 4 | 4 |
| Malign | 6 | 4 | 2 | 2 |
| Malignant | 9 | 6 | 3 | 3 |
| Menacing | 8 | 5 | 3 | 3 |
| Mephistophelean | 15 | 9 | 6 | 5 |
| Mephistophelian | 15 | 9 | 6 | 6 |
| Minacious | 9 | 4 | 5 | 3 |
| Minatory | 8 | 5 | 3 | 4 |
| Mischief Loving | 15 | 10 | 5 | 4 |
| Mischievous | 11 | 6 | 5 | 3 |
| Monstrous | 9 | 6 | 3 | 2 |
| Morbid | 6 | 4 | 2 | 2 |
| Murderous | 9 | 5 | 4 | 3 |
| Naughty | 7 | 5 | 2 | 2 |
| Nefarious | 9 | 4 | 5 | 4 |

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