...“Belle-Isle is impregnable... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...That is an impregnable place of refuge...
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」
...I, for instance, am proud; that is to say, impregnable...
Alexandre Dumas, Pere 「Ten Years Later」
...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」
... The place was impregnable unless guns were brought up to theheights...
John Buchan 「Prester John」
...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」
...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」
..."We're impregnable here...
Various 「Astounding Stories, July, 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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