| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Incapacitation | 14 | 7 | 7 | 6 |
| Incompatibility | 15 | 9 | 6 | 7 |
| Incompatibleness | 16 | 10 | 6 | 6 |
| Inconvenience | 13 | 7 | 6 | 5 |
| Indulgence | 10 | 6 | 4 | 3 |
| Infection | 9 | 5 | 4 | 3 |
| Infliction | 10 | 6 | 4 | 3 |
| Infraction | 10 | 6 | 4 | 3 |
| Infringement | 12 | 8 | 4 | 4 |
| Inharmoniousness | 16 | 9 | 7 | 6 |
| Inharmony | 9 | 6 | 3 | 4 |
| Inhumanity | 10 | 6 | 4 | 5 |
| Inhuman Treatment | 17 | 11 | 6 | 5 |
| Iniquitousness | 14 | 7 | 7 | 5 |
| Iniquity | 8 | 4 | 4 | 4 |
| Injury | 6 | 4 | 2 | 3 |
| Injustice | 9 | 5 | 4 | 3 |
| Inroad | 6 | 3 | 3 | 2 |
| Interpolate | 11 | 6 | 5 | 4 |
| Interruption | 12 | 7 | 5 | 4 |
| Invidiousness | 13 | 7 | 6 | 5 |
| Irritation | 10 | 5 | 5 | 4 |
| Jack | 4 | 3 | 1 | 1 |
| Jangle | 6 | 4 | 2 | 2 |
| Jar | 3 | 2 | 1 | 1 |
| Jingle | 6 | 4 | 2 | 2 |
| Joke | 4 | 2 | 2 | 1 |
| Joker | 5 | 3 | 2 | 2 |
| Jokester | 8 | 5 | 3 | 3 |
| Knave | 5 | 3 | 2 | 1 |
| Knavery | 7 | 5 | 2 | 3 |
| Knavishness | 11 | 8 | 3 | 3 |
| Lark | 4 | 3 | 1 | 1 |
| Laying Waste | 12 | 8 | 4 | 2 |
| Legal Injury | 12 | 8 | 4 | 5 |

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