impregnable

Part of speech: adverb

Impregnably.

Part of speech: noun

IMPREGNABILITY.

Part of speech: adjective

Proof against attack; unconquerable.

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Usage examples "impregnable":

  1. Evan made an appeal to his reason, but finding that impregnable, he pulled out his scanty purse to guarantee his sincerity with an offer of pledgemoney. - "The Complete Project Gutenberg Works of George Meredith", George Meredith.
  2. With those two on guard, Appleboro knew its bank was as impregnable as Gibraltar. - "Slippy McGee, Sometimes Known as the Butterfly Man", Marie Conway Oemler.
  3. You must know that I held a high official position in the religious world- I will mention no details- and I found at an early age, I am glad to say, the imperative necessity of forming absolutely impregnable convictions. - "The Child of the Dawn", Arthur Christopher Benson.