| Solution | Length | |
|---|---|---|
| 5 letters | ||
| joker | 5 | |
| 6 letters | ||
| virgin | 6 | |
| sealed | 6 | |
| 7 letters | ||
| pitfall | 7 | |
| strange | 7 | |
| unknown | 7 | |
| 8 letters | ||
| puzzling | 8 | |
| RECEIVED | 8 | |
| 9 letters | ||
| uncharted | 9 | |
| untouched | 9 | |
| unbeknown | 9 | |
| unplumbed | 9 | |
| UNEXPOSED | 9 | |
| UNDOUBTED | 9 | |
| 10 letters | ||
| unrevealed | 10 | |
| UNKNOWABLE | 10 | |
| feetofclay | 10 | |
| undisputed | 10 | |
| unfathomed | 10 | |
| unheard-of | 10 | |
| UNEXPLORED | 10 | |
| unfamiliar | 10 | |
| 11 letters | ||
| uncontested | 11 | |
| UNEXPLAINED | 11 | |
| UNDISCLOSED | 11 | |
| UNPERCEIVED | 11 | |
| 12 letters | ||
| UNIDENTIFIED | 12 | |
| UNQUESTIONED | 12 | |
| unclassified | 12 | |
| UNDISCOVERED | 12 | |
| 14 letters | ||
| undiscoverable | 14 | |