...Athos knew from experience that D’Artagnan became impenetrable when engaged in any serious affair, whether on his own account or on the service of the king... 
Alexandre Dumas, Pere 「The Man in the Iron Mask」
...But he little knew his Greatness, who was never more impenetrable than at dessert...
Alexandre Dumas, Pere 「Louise de la Valliere」
... 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 some deltas, as that of Luaba and Kasokwe, morasses have been formed, in which the matete and papyrus jungle is impenetrable...
Henry M. Stanley 「How I Found Livingstone」
...This was exceedingly thick, and quite impenetrable, except in the places where elephants and other heavy animals had trodden numerous alleys...
Samuel White Baker 「In the Heart of Africa」
...We struggled up steep hills, fairly bucking our way through low growth that proved all but impenetrable...
Stewart Edward White 「African Camp Fires」
...At someplaces this hedge is growing; at others, it consistsmerely of branches cut from various trees, butrendered almost impenetrable by being made broadand thick...
James Richardson 「Narrative of a Mission to Central Africa Performed in the Years 1850-51, Volume 2」
...He had knowledge of a place where the undergrowth and bushes were almost impenetrable...
William Still 「The Underground Railroad」
...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 surrounded the ship...
William Wells Brown 「Clotelle」
...Their nests are built in impenetrable thickets,rushes or mangroves, the nests being constructed like those of the White Ibis...
Chester A. Reed 「The Bird Book」
...In the swamps of the South they make their home in dense and almost impenetrable thickets and canebrakes, where they make a nest of sticks, grass, moss and leaves...
Elmer Harry Kreps 「Science of Trapping」
...A little further,and we scarcely moved—stepping like catsfrom tree to tree, expecting every second tohear an angry grunt and have the bull emergefrom the impenetrable veil of night that hungaround us...
Various 「Hunting in Many Lands」
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different Sylvester Oto
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