| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Infatuated | 10 | 5 | 5 | 5 |
| Infatuated With | 15 | 9 | 6 | 6 |
| Infuriated | 10 | 5 | 5 | 5 |
| Insane | 6 | 3 | 3 | 2 |
| Intoxicating | 12 | 7 | 5 | 5 |
| In Love | 7 | 4 | 3 | 2 |
| Irrational | 10 | 5 | 5 | 4 |
| Irregular | 9 | 5 | 4 | 4 |
| Irritable | 9 | 5 | 4 | 4 |
| Just Plain Nuts | 15 | 11 | 4 | 3 |
| Keen | 4 | 2 | 2 | 1 |
| Kookie | 6 | 2 | 4 | 2 |
| Kooky | 5 | 3 | 2 | 2 |
| Lathery | 7 | 5 | 2 | 3 |
| Laughable | 9 | 5 | 4 | 3 |
| Leaven | 6 | 3 | 3 | 2 |
| Leavening | 9 | 5 | 4 | 3 |
| Leguminose | 10 | 5 | 5 | 4 |
| Leguminous | 10 | 5 | 5 | 4 |
| Light Headed | 12 | 8 | 4 | 3 |
| Lightheaded | 11 | 7 | 4 | 3 |
| Loaded | 6 | 3 | 3 | 2 |
| Loco | 4 | 2 | 2 | 2 |
| Loggerheaded | 12 | 7 | 5 | 4 |
| Looney | 6 | 3 | 3 | 2 |
| Loony | 5 | 3 | 2 | 2 |
| Loopy | 5 | 3 | 2 | 2 |
| Lost | 4 | 3 | 1 | 1 |
| Ludicrous | 9 | 5 | 4 | 3 |
| Lunatic | 7 | 4 | 3 | 3 |
| Mad | 3 | 2 | 1 | 1 |
| Madcap | 6 | 4 | 2 | 2 |
| Maddened | 8 | 5 | 3 | 2 |
| Madman | 6 | 4 | 2 | 2 |
| Mad About | 9 | 5 | 4 | 3 |

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