| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Execrable | 9 | 5 | 4 | 4 |
| Fauna | 5 | 2 | 3 | 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 |
| Flagitious | 10 | 5 | 5 | 4 |
| Foolish | 7 | 4 | 3 | 2 |
| Forbidding | 10 | 7 | 3 | 3 |
| Foxy | 4 | 3 | 1 | 2 |
| Frightful | 9 | 7 | 2 | 2 |
| Frolicky | 8 | 6 | 2 | 3 |
| Frolicsome | 10 | 6 | 4 | 3 |
| Full Of Mischief | 16 | 11 | 5 | 4 |
| Furious | 7 | 3 | 4 | 3 |
| Ghoulish | 8 | 5 | 3 | 2 |
| Gooselike | 9 | 4 | 5 | 3 |
| Goosey | 6 | 3 | 3 | 2 |
| Goosy | 5 | 3 | 2 | 2 |
| Gory | 4 | 3 | 1 | 2 |
| Grievous | 8 | 4 | 4 | 2 |
| Guileful | 8 | 4 | 4 | 3 |
| Hadean | 6 | 3 | 3 | 2 |
| Harsh | 5 | 4 | 1 | 1 |
| Harum Scarum | 12 | 8 | 4 | 4 |
| Heinous | 7 | 3 | 4 | 2 |
| Hellish | 7 | 5 | 2 | 2 |
| High Spirited | 13 | 9 | 4 | 4 |
| Homicidal | 9 | 5 | 4 | 4 |
| Horrible | 8 | 5 | 3 | 3 |
| Horrifying | 10 | 7 | 3 | 4 |
| Hothead | 7 | 4 | 3 | 2 |

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