...impenetrable, impenetrable... 
Gustavo Adolfo Becquer 「Legends, Tales and Poems」
...A hundred yards away, deep in the tangle of impenetrable jungle, Numa,the lion, raised his massive head...
Edgar Rice Burroughs 「Jungle Tales of Tarzan」
... Baisemeaux had not been at the Palais Royal with D’Artagnan the same cold and impenetrable man which the latter now found in the Baisemeaux of the Bastile...
Alexandre Dumas, Pere 「Louise de la Valliere」
... Just beyond the doorway hefound the passage completely clogged and choked by impenetrable massesof shattered rock...
Edgar Rice Burroughs 「Tarzan and the Jewels of Opar」
... She could seethe grass about her and the boles of the trees which stood out inbrilliant relief against the solid background of impenetrable night,and beyond the firelight there was nothing...
Edgar Rice Burroughs 「Tarzan the Untamed」
... Our path lay along the bed of the Nake for some distance, the banks being covered with impenetrable thickets...
David Livingstone 「Missionary Travels and Researches in South Africa」
...In the first place, a leaden bullet is of little use against their tough hides and, I may almost say, impenetrable foreheads...
Captain Frederick Marryat 「The Mission; or Scenes in Africa」
...The dead trunk of a fallen tree lay straight in front, torn and twisted, its top hidden yonder and mingled with impenetrable undergrowth...
W. E. B. Du Bois 「The Quest of the Silver Fleece」
...The winds increased with nightfall, and impenetrable gloom surroundedthe ship...
William Wells Brown 「Clotelle: a Tale of the Southern States」
...They breed in impenetrable swamps,very often in company with the following species,and also with Louisiana and Little BlueHerons, and White Ibises...
Chester A. Reed 「The Bird Book」
...—A similar legend is found again in the third book ofthe Mahâbhâratam, under the form of an impenetrable forest, in whichthe king of the serpents envelops Bhîmas...
Angelo de Gubernatis 「Zoological Mythology, Volume I (of 2)」
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