| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Indiscreet | 10 | 6 | 4 | 3 |
| Inept | 5 | 3 | 2 | 2 |
| Inexpedient | 11 | 6 | 5 | 6 |
| Infuriated | 10 | 5 | 5 | 5 |
| Injudicious | 11 | 5 | 6 | 4 |
| Innocent | 8 | 5 | 3 | 3 |
| Insane | 6 | 3 | 3 | 2 |
| Insensate | 9 | 5 | 4 | 3 |
| Insentient | 10 | 6 | 4 | 4 |
| Intuitive | 9 | 4 | 5 | 3 |
| Invalid | 7 | 4 | 3 | 3 |
| Irrational | 10 | 5 | 5 | 4 |
| Kookie | 6 | 2 | 4 | 2 |
| Kooky | 5 | 3 | 2 | 2 |
| Lackbrained | 11 | 7 | 4 | 2 |
| Lean Minded | 11 | 7 | 4 | 3 |
| Lean Witted | 11 | 7 | 4 | 3 |
| Loco | 4 | 2 | 2 | 2 |
| Looney | 6 | 3 | 3 | 2 |
| Loony | 5 | 3 | 2 | 2 |
| Loopy | 5 | 3 | 2 | 2 |
| Loose | 5 | 2 | 3 | 1 |
| Loosen | 6 | 3 | 3 | 2 |
| Lost | 4 | 3 | 1 | 1 |
| Lumpen | 6 | 4 | 2 | 2 |
| Lumpish | 7 | 5 | 2 | 2 |
| Lunatic | 7 | 4 | 3 | 3 |
| Mad | 3 | 2 | 1 | 1 |
| Madcap | 6 | 4 | 2 | 2 |
| Maddened | 8 | 5 | 3 | 2 |
| Manic | 5 | 3 | 2 | 2 |
| Mazed | 5 | 3 | 2 | 1 |
| Mental | 6 | 4 | 2 | 2 |
| Mentally Deficient | 18 | 12 | 6 | 7 |
| Meshuggah | 9 | 6 | 3 | 3 |

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