| Solution | Length | |
|---|---|---|
| 3 letters | ||
| rye | 3 | |
| dim | 3 | |
| 4 letters | ||
| nina | 4 | |
| deep | 4 | |
| dark | 4 | |
| hard | 4 | |
| 5 letters | ||
| perdu | 5 | |
| angle | 5 | |
| inner | 5 | |
| privy | 5 | |
| black | 5 | |
| vague | 5 | |
| shown | 5 | |
| 6 letters | ||
| secret | 6 | |
| veiled | 6 | |
| buried | 6 | |
| angles | 6 | |
| unseen | 6 | |
| arcane | 6 | |
| mystic | 6 | |
| untold | 6 | |
| latent | 6 | |
| subtle | 6 | |
| cached | 6 | |
| agenda | 6 | |
| covert | 6 | |
| occult | 6 | |
| 7 letters | ||
| unknown | 7 | |
| obscure | 7 | |
| private | 7 | |
| retired | 7 | |
| stashed | 7 | |
| curious | 7 | |
| virtual | 7 | |
| cloaked | 7 | |
| furtive | 7 | |
| STIFLED | 7 | |
| encased | 7 | |
| 8 letters | ||
| profound | 8 | |
| emergent | 8 | |
| secreted | 8 | |
| mystical | 8 | |
| SHROUDED | 8 | |
| sneaking | 8 | |
| sleeping | 8 | |
| unspoken | 8 | |
| secluded | 8 | |
| ulterior | 8 | |
| 9 letters | ||
| concealed | 9 | |
| unuttered | 9 | |
| unnoticed | 9 | |
| RECONDITE | 9 | |
| smothered | 9 | |
| SUBMERGED | 9 | |
| difficult | 9 | |
| sightless | 9 | |
| 10 letters | ||
| outofsight | 10 | |
| underdosed | 10 | |
| UNDERLYING | 10 | |
| SUPPRESSED | 10 | |
| MYSTERIOUS | 10 | |
| undercover | 10 | |
| unrevealed | 10 | |
| top-secret | 10 | |
| UNREALIZED | 10 | |
| unobserved | 10 | |
| restricted | 10 | |
| 11 letters | ||
| UNDISCLOSED | 11 | |
| underground | 11 | |
| unutterable | 11 | |
| SEQUESTERED | 11 | |
| UNDER WRAPS | 11 | |
| clandestine | 11 | |
| UNPERCEIVED | 11 | |
| 12 letters | ||
| subconscious | 12 | |
| juliuscaesar | 12 | |
| 13 letters | ||
| surreptitious | 13 | |
| undisclosable | 13 | |
| 14 letters | ||
| UNINTELLIGIBLE | 14 | |
| TRANSCENDENTAL | 14 | |
| 15 letters | ||
| betweenthelines | 15 | |
| ulteriormotives | 15 | |