| Front | impregnable |
|---|---|
| Back | BrE /ɪmˈpreɡnəbl/NAmE /ɪmˈpreɡnəbl/ adjective 1 an impregnable building is so strongly built that it cannot be entered by force an impregnable fortress 2 strong and impossible to defeat or change(＝ invincible)  The team built up an impregnable 5–1 lead.  the seemingly impregnable Nazi regime |
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