...Petersburg runs for a hundred leagues through morasses, and which threehundred peasants might in a single day render impassable... 
George Grote 「The Two Great Retreats of History」
...He learnt of that reconciliation now; but he learnt at the same time that the breach was now renewed, and rendered wider and more impassable than ever...
Rafael Sabatini 「Scaramouche」
... and an impassable barrier was built up between her and the man she worshipped! ...
Baroness Emmuska Orczy 「The Elusive Pimpernel」
...This was fortunate, as we knew the way the strangers had come was impassable for wagons...
David Livingstone 「Missionary Travels and Researches in South Africa」
...They would be impassable on account of the heaps of dead vegetation lying on the surface, and emitting worse effluvia than the comparatively small unburied collections do now...
David Livingstone 「Missionary Travels and Researches in South Africa」
...This bit of country must be absolutely impassable for any human being,black or white, except during the dry season...
Mary H. Kingsley 「Travels in West Africa」
...Much reedy grass, fully half an inch indiameter in the stalk on our route, and over the top of the rangeMoloni, which we ascended: the valleys are impassable...
David Livingstone 「The Last Journals of David Livingstone, in Central Africa, from 1865 to His Death, Volume II (of 2), 1869-1873」
...How to get to the water, for we feared that we should find muddy banks, which might prove impassable...
W.H.G. Kingston 「The Two Supercargoes」
...The great gulf that separates the human species fromthe rest of the animals is the impassable one of intellect...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Thus a trench seven feet wide is impassable to an elephant, thoughthe step of a large one in full stride is about six and a half feet...
Robert A. Sterndale 「Natural History of the Mammalia of India and Ceylon」
...Sometimes one can find a long, deep ravine which is practically impassable to wolves and coyotes...
A. R. (Arthur Robert) Harding 「Wolf and Coyote Trapping」
...I adviseyou to keep ahead of such drives when you take such a trip, becausethe trampling of so many feet makes a road almost impassable...
Elinore Pruitt Stewart 「Letters on an Elk Hunt」
...As far as the eye could reach, it rested upon the same deep impassable masses...
Mayne Reid 「The Hunters' Feast」
...All of thesechannels are considerable torrents even in the mostfavourable conditions and it is by no means easy to crossthem, but in the very frequent times of flood they areabsolutely impassable...
A. F. R. Wollaston 「Pygmies and Papuans」
...Throughout nearly its wholeextent it is impassable to wagons...
Cosmos Mindeleff 「Navaho Houses, pages 469-518」
...Thissubstance when dried is more or less impassable and affords protectionto the eggs from the elements and secures an easy outlet to the surfacefor the young locust when hatched...
Various 「Argentina From A British Point Of View」
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