| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Exorbitant | 10 | 6 | 4 | 4 |
| Extortionate | 12 | 6 | 6 | 4 |
| Fauna | 5 | 2 | 3 | 2 |
| Fearful | 7 | 4 | 3 | 2 |
| Fearsome | 8 | 4 | 4 | 2 |
| Fell | 4 | 3 | 1 | 1 |
| Feral | 5 | 3 | 2 | 2 |
| Ferine | 6 | 3 | 3 | 2 |
| Ferocious | 9 | 4 | 5 | 3 |
| Fiendish | 8 | 5 | 3 | 3 |
| Fiendlike | 9 | 5 | 4 | 3 |
| Fierce | 6 | 3 | 3 | 1 |
| Filthy | 6 | 5 | 1 | 2 |
| Flagitious | 10 | 5 | 5 | 4 |
| Fleshly | 7 | 6 | 1 | 2 |
| Forbidding | 10 | 7 | 3 | 3 |
| Foul | 4 | 2 | 2 | 1 |
| Frantic | 7 | 5 | 2 | 2 |
| Frenetic | 8 | 5 | 3 | 3 |
| Frenzied | 8 | 5 | 3 | 2 |
| Frightening | 11 | 8 | 3 | 3 |
| Frightful | 9 | 7 | 2 | 2 |
| Furious | 7 | 3 | 4 | 3 |
| Ghoulish | 8 | 5 | 3 | 2 |
| Glowering | 9 | 6 | 3 | 3 |
| Glum | 4 | 3 | 1 | 1 |
| Godless | 7 | 5 | 2 | 2 |
| Gory | 4 | 3 | 1 | 2 |
| Grievous | 8 | 4 | 4 | 2 |
| Grotesque | 9 | 5 | 4 | 2 |
| Guilty | 6 | 4 | 2 | 2 |
| Gusty | 5 | 4 | 1 | 2 |
| Hadean | 6 | 3 | 3 | 2 |
| Hangdog | 7 | 5 | 2 | 2 |
| Harsh | 5 | 4 | 1 | 1 |

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