| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Finite | 6 | 3 | 3 | 2 |
| Flimsy | 6 | 5 | 1 | 2 |
| Fractional | 10 | 6 | 4 | 3 |
| Gaseous | 7 | 3 | 4 | 3 |
| Ghostlike | 9 | 6 | 3 | 2 |
| Ghostly | 7 | 6 | 1 | 2 |
| Gilded | 6 | 4 | 2 | 2 |
| Gossamery | 9 | 6 | 3 | 4 |
| Grotesque | 9 | 5 | 4 | 2 |
| Groundless | 10 | 7 | 3 | 2 |
| Hallucinatory | 13 | 8 | 5 | 6 |
| High Flown | 10 | 8 | 2 | 2 |
| High Minded | 11 | 8 | 3 | 3 |
| Hypothetic | 10 | 7 | 3 | 4 |
| Hypothetical | 12 | 8 | 4 | 5 |
| Ideal | 5 | 2 | 3 | 2 |
| Idealistic | 10 | 5 | 5 | 4 |
| Ideational | 10 | 4 | 6 | 4 |
| Idle | 4 | 2 | 2 | 2 |
| Illusional | 10 | 5 | 5 | 4 |
| Illusionary | 11 | 6 | 5 | 5 |
| Illusionist | 11 | 6 | 5 | 4 |
| Illusive | 8 | 4 | 4 | 3 |
| Illusory | 8 | 5 | 3 | 4 |
| Imaginary | 9 | 5 | 4 | 5 |
| Imaginational | 13 | 6 | 7 | 6 |
| Imaginative | 11 | 5 | 6 | 5 |
| Imagined | 8 | 4 | 4 | 3 |
| Immaterial | 10 | 5 | 5 | 5 |
| Impair | 6 | 3 | 3 | 2 |
| Impossible | 10 | 6 | 4 | 4 |
| Inaccurate | 10 | 5 | 5 | 4 |
| Inane | 5 | 2 | 3 | 2 |
| Infinite | 8 | 4 | 4 | 3 |
| Ingenious | 9 | 4 | 5 | 4 |

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