...That is an impregnable place of refuge... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...I, for instance, am proud; that is to say, impregnable...
Alexandre Dumas, Pere 「Ten Years Later」
... 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」
...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]」
...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」
...There has thus been a gradual tendency todrift from readily accessible locations to the most impregnable sites,which indicates how severely the Hopi must have been harassed bytheir foes...
Jesse Walter Fewkes 「Archeological Expedition to Arizona in 1895」
...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」
...o the Ralas have ruled from this impregnable amphibian city...
Various 「Astounding Stories of Super-Science, August 1930」
...Saret Balisle seemedto be impregnable...
Arthur J. Burks 「The Mind Master」
...This ancient and impregnable fact has been ignored...
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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