| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Imperceptible | 13 | 8 | 5 | 5 |
| Impotent | 8 | 5 | 3 | 3 |
| Inanity | 7 | 4 | 3 | 4 |
| Inaudible | 9 | 4 | 5 | 4 |
| Indefinite | 10 | 5 | 5 | 4 |
| Indeterminate | 13 | 7 | 6 | 5 |
| Indiscernible | 13 | 8 | 5 | 5 |
| Indisposed | 10 | 6 | 4 | 3 |
| Indistinct | 10 | 7 | 3 | 3 |
| Indistinguishable | 17 | 10 | 7 | 6 |
| Infirm | 6 | 4 | 2 | 2 |
| Invertebrate | 12 | 7 | 5 | 4 |
| Invisible | 9 | 5 | 4 | 4 |
| In Danger | 9 | 6 | 3 | 3 |
| Jade | 4 | 2 | 2 | 1 |
| Jaded | 5 | 3 | 2 | 2 |
| Jailbreak | 9 | 5 | 4 | 2 |
| Jazz | 4 | 3 | 1 | 1 |
| Kayo | 4 | 2 | 2 | 1 |
| Keel Over | 9 | 5 | 4 | 3 |
| Knockout | 8 | 5 | 3 | 2 |
| Knock Cold | 10 | 8 | 2 | 2 |
| Knock Out | 9 | 6 | 3 | 2 |
| Knuckle Under | 13 | 9 | 4 | 3 |
| KO | 2 | 1 | 1 | 1 |
| Lackadaisical | 13 | 7 | 6 | 5 |
| Lackluster | 10 | 7 | 3 | 3 |
| Lacklustre | 10 | 7 | 3 | 3 |
| Laid Low | 8 | 5 | 3 | 2 |
| Languid | 7 | 4 | 3 | 2 |
| Languish | 8 | 5 | 3 | 2 |
| Languor | 7 | 4 | 3 | 2 |
| Languorous | 10 | 5 | 5 | 3 |
| Leaden | 6 | 3 | 3 | 2 |
| Lenient | 7 | 4 | 3 | 3 |

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