| Synonyms | Length | Vowels | Syllables | |
|---|---|---|---|---|
| Dark | 4 | 3 | 1 | 1 |
| Darkness | 8 | 6 | 2 | 2 |
| Dead | 4 | 2 | 2 | 1 |
| Dead End | 8 | 5 | 3 | 2 |
| Deaf | 4 | 2 | 2 | 1 |
| Deaf To Reason | 14 | 8 | 6 | 4 |
| Dictator | 8 | 5 | 3 | 3 |
| Discourteous | 12 | 6 | 6 | 4 |
| Dummy | 5 | 4 | 1 | 2 |
| Enigma | 6 | 3 | 3 | 3 |
| Enigmatic | 9 | 5 | 4 | 4 |
| Esoteric | 8 | 4 | 4 | 4 |
| Fanatic | 7 | 4 | 3 | 3 |
| Fanatical | 9 | 5 | 4 | 4 |
| Finale | 6 | 3 | 3 | 2 |
| Finis | 5 | 3 | 2 | 2 |
| Flinty | 6 | 5 | 1 | 2 |
| Futurea | 7 | 3 | 4 | 3 |
| Granitic | 8 | 5 | 3 | 3 |
| Hermetic | 8 | 5 | 3 | 3 |
| Hidden | 6 | 4 | 2 | 2 |
| Hidebound | 9 | 5 | 4 | 3 |
| Hush Hush | 9 | 7 | 2 | 2 |
| Illiberal | 9 | 5 | 4 | 4 |
| Immovable | 9 | 5 | 4 | 4 |
| Immoveable | 10 | 5 | 5 | 4 |
| Impenetrable | 12 | 7 | 5 | 5 |
| Impersuadable | 13 | 7 | 6 | 6 |
| Impersuasible | 13 | 7 | 6 | 6 |
| Imperviable | 11 | 6 | 5 | 5 |
| Impervious | 10 | 5 | 5 | 4 |
| Inaccessible | 12 | 7 | 5 | 5 |
| Indefinable | 11 | 6 | 5 | 5 |
| Indescribable | 13 | 8 | 5 | 5 |
| Ineffable | 9 | 5 | 4 | 4 |

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