...“Belle-Isle is impregnable... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
... The thorn boma round it wasthe strongest and most impregnable that the Mosula could construct...
Edgar Rice Burroughs 「The Beasts of Tarzan」
... Impregnable city ofPal-ul-don—alone of all the cities it has never been entered by afoeman since it was built there while Jad-ben-Otho was a boy...
Edgar Rice Burroughs 「Tarzan the Terrible」
...Its tough, armoredhide was impregnable to their knife thrusts while their thrown clubsrattled from it as futilely as if hurled at the rocky shoulder ofPastar-ul-ved...
Edgar Rice Burroughs 「Tarzan the Terrible」
...Thesituation was almost impregnable, being everywhere surroundedwith high precipices, except on the eastern side, where thenatives had left a pathway sufficient to allow one person at atime to ascend...
Mungo Park 「Travels in the Interior of Africa, Vol. 2 [of 2]」
...Instead of endeavoring to render Paris impregnable, try rather to render the loss of Paris an insignificant matter...
P. J. Proudhon 「What is Property?」
...If they wish the trade to continue, let it bebased on the impregnable ground that the merchants want the money,and not on a fantastic dream that is too silly to deceive even achild that knows birds...
William T. Hornaday 「Our Vanishing Wild Life」
...Built up at haphazard, all these things make an impregnable wall...
J. Henri Fabre Alexander Teixeira de Mattos 「The Life of the Fly」
... These pear-shaped hollows form splendid lodgings, impregnable strongholds, in which the Osmiae find a safe and commodious retreat for their families...
J. Henri Fabre 「Bramble-bees and Others」
...The builders evidently placed the greatestreliance on their impregnable site, and freely adopted such arrangementas convenience dictated...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...The tower episode solidified my power, and made it impregnable...
Mark Twain (Samuel Clemens) 「A Connecticut Yankee in King Arthur’s Court, Complete」
..."We're impregnable here...
Various 「Astounding Stories, July, 1931」
...o the Ralas have ruled from this impregnable amphibian city...
Various 「Astounding Stories of Super-Science, August 1930」
..."You know that amphibian city is almost impregnable because humans canhardly live long enough under the water to get into it, let alonefight under water as the frog-men can...
Various 「Astounding Stories of Super-Science, August 1930」
...Saret Balisle seemedto be impregnable...
Arthur J. Burks 「The Mind Master」
...Those equipped with ladders of science have so often scaled thewalls which surround cities of ignorance that they march forward in thesure faith that none of Nature's battlements are impregnable...
Dr. D.M. Brooks 「The Necessity of Atheism」
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