Learn how to say Impregnability correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word impregnable:
(of a fortified position) unable to be captured or broken into:
a massive and impregnable fortress
the seat I was offered appeared to be an impregnable Tory stronghold
unable to be defeated or overcome:
Liverpool used their good fortune to forge an impregnable lead
late Middle English: from Old French imprenable, from in- ‘not’ + prendre ‘take’ (from Latin prehendere). The current spelling arose in the 16th century, perhaps influenced by Old French variants