| Solution | Length | |
|---|---|---|
| 4 letters | ||
| many | 4 | |
| 6 letters | ||
| unsung | 6 | |
| secret | 6 | |
| unsaid | 6 | |
| silent | 6 | |
| 7 letters | ||
| endless | 7 | |
| STIFLED | 7 | |
| unknown | 7 | |
| UNFIXED | 7 | |
| 8 letters | ||
| TERMLESS | 8 | |
| unspoken | 8 | |
| unvoiced | 8 | |
| wordless | 8 | |
| ulterior | 8 | |
| 9 letters | ||
| undecided | 9 | |
| unlimited | 9 | |
| unsettled | 9 | |
| smothered | 9 | |
| uncounted | 9 | |
| unplumbed | 9 | |
| unwritten | 9 | |
| unuttered | 9 | |
| universal | 9 | |
| unbounded | 9 | |
| 10 letters | ||
| numberless | 10 | |
| unrevealed | 10 | |
| unmeasured | 10 | |
| UNNUMBERED | 10 | |
| restricted | 10 | |
| SUPPRESSED | 10 | |
| top-secret | 10 | |
| UNDECLARED | 10 | |
| 11 letters | ||
| UNEXPRESSED | 11 | |
| UNDER WRAPS | 11 | |
| UNDISCLOSED | 11 | |
| unutterable | 11 | |
| SUSPENSEFUL | 11 | |
| 12 letters | ||
| unfathomable | 12 | |
| incalculable | 12 | |
| unpronounced | 12 | |
| UNDETERMINED | 12 | |
| 13 letters | ||
| unestablished | 13 | |
| undisclosable | 13 | |
| 15 letters | ||
| uncircumscribed | 15 | |