| Answer | Crossword Clue |
|---|---|
| DENSER | More impenetrable. |
| DENSER | More impenetrable |
| ARCANE | Impenetrable |
| DENSE | Impenetrable |
| AIRTIGHT | Impenetrable. |
| ADAMANTINE | Impenetrable. |
| HARD | Impenetrable |
| SOLID | Impenetrable |
| DENSE | Impenetrable. |
| DENSEST | Most impenetrable. |
| DENSE | Practically impenetrable |
| BAFFLEGAB | Impenetrable prose |
| GOBBLEDEGOOK | Impenetrable language |
| SCRAWL | Impenetrable script |
| OPAQUE | Impenetrable, in a way |
| STRONGARMOR | Impenetrable suit for a knight? |
| UGANDA | Home of Bwindi Impenetrable National Park |
