Answer: unassailable
| Clue | Length | Answer |
|---|---|---|
| Impregnable | 4 letters | safe |
| ||
| Impregnable | 5 letters | proof |
| ||
| Impregnable | 6 letters | strict |
| ||
| Impregnable | 6 letters | secure |
| ||
| Impregnable | 7 letters | tenable |
| ||
| Impregnable | 7 letters | undying |
| ||
| Impregnable | 7 letters | unasked |
| ||
| Impregnable | 9 letters | immovable |
| Impregnable | 10 letters | unbeatable |
| ||
| Impregnable | 10 letters | unyielding |
| Impregnable | 10 letters | invincible |
| ||
| Impregnable | 11 letters | unsubduable |
| Impregnable | 11 letters | insuperable |
| ||
| Impregnable | 11 letters | indomitable |
| ||
| Impregnable | 11 letters | unalterable |
| ||
| Impregnable | 12 letters | inexpugnable |
| Impregnable | 12 letters | irresistible |
| Impregnable | 12 letters | unquenchable |
| Impregnable | 12 letters | unassailable |
| ||
| Impregnable | 12 letters | indisputable |
| ||
| Impregnable | 13 letters | unimpeachable |
| Impregnable | 13 letters | unconquerable |
| Impregnable | 14 letters | insurmountable |
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