...Harding, Gideon, Spilett, Herbert, Pencroft, and Neb postedthemselves in impregnable line... 
Jules Verne William Henry Giles Kingston 「Abandoned」
...That is an impregnable place of refuge...
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...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」
...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」
...On the southern portion of this impregnable site and grouped about apoint where nearly the whole drainage of the mesa top collects, arefound the village remains...
Victor Mindeleff and Cosmos Mindeleff 「A Study of Pueblo Architecture: Tusayan and Cibola」
...They had no great name touphold; no riches to expend in impregnable walls and towers...
Elise Whitlock Rose 「Cathedrals and Cloisters of the South of France, Volume 1」
...The tower episode solidified my power, and made it impregnable...
Mark Twain (Samuel Clemens) 「A Connecticut Yankee in King Arthur’s Court, Complete」
...With such a defensethe Capitol and its grounds seemed impregnable...
Various 「Astounding Stories, June, 1931」
...This ancient and impregnable fact has been ignored...
Dr. D.M. Brooks 「The Necessity of Atheism」
...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」
...Blessed are they that judge this impregnable Cause, thisglorious Announcement, with fairness and equity...
Bahá’u’lláh 「Tablets of Bahá’u’lláh Revealed after the Kitab-i-Aqdas」
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