| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Felonious | 9 | 4 | 5 | 4 |
| Fishy | 5 | 4 | 1 | 2 |
| Flukey | 6 | 4 | 2 | 2 |
| Fluky | 5 | 4 | 1 | 2 |
| Fly By Night | 12 | 11 | 1 | 3 |
| Forbidding | 10 | 7 | 3 | 3 |
| Foxy | 4 | 3 | 1 | 2 |
| Fraudulent | 10 | 6 | 4 | 3 |
| Funny | 5 | 4 | 1 | 2 |
| Grandiloquent | 13 | 8 | 5 | 4 |
| Guileful | 8 | 4 | 4 | 3 |
| Hallucinatory | 13 | 8 | 5 | 6 |
| Hardly Possible | 15 | 11 | 4 | 5 |
| Hard Of Belief | 14 | 9 | 5 | 4 |
| Hard To Believe | 15 | 9 | 6 | 4 |
| Hunched | 7 | 5 | 2 | 1 |
| Idiotic | 7 | 3 | 4 | 4 |
| Iffy | 4 | 3 | 1 | 2 |
| Illusive | 8 | 4 | 4 | 3 |
| Illusory | 8 | 5 | 3 | 4 |
| Ill Got | 7 | 5 | 2 | 2 |
| Ill Gotten | 10 | 7 | 3 | 3 |
| Immoral | 7 | 4 | 3 | 3 |
| Impious | 7 | 3 | 4 | 3 |
| Implausible | 11 | 6 | 5 | 4 |
| Impossible | 10 | 6 | 4 | 4 |
| Improbable | 10 | 6 | 4 | 4 |
| Incertain | 9 | 5 | 4 | 3 |
| Inconceivable | 13 | 7 | 6 | 5 |
| Incredible | 10 | 6 | 4 | 4 |
| Indirect | 8 | 5 | 3 | 3 |
| Inglorious | 10 | 5 | 5 | 4 |
| Inquisitive | 11 | 5 | 6 | 4 |
| Insidious | 9 | 4 | 5 | 4 |
| In Dispute | 10 | 6 | 4 | 3 |

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