...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」
...Thus the Mangrove presents the appearance of a large tree, supported by hundreds of lesser trunks, standing so thickly together as to be impassable for even small animals...
Horatio Bridge 「Journal of an African Cruiser」
... Summoned away to her account, with the impassable gulf of slavery between us during her entire illness, my mother died without leaving me a single intimation of who my father was...
Frederick Douglass 「My Bondage and My Freedom」
...Nature seems to have placed in its little head the belief that in running to the leeward it will encounter some impassable barrier, and be overtaken by whatever pursues it...
Mayne Reid 「The Giraffe Hunters」
...The “canon,” a deep valley in which they had encamped, was difficult to get through at any time, but now the path, on account of the deep soft snow, was rendered impassable...
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」
...One adventurous party proceeded until they reachedan opening on the other side of the hill; but this was so choked byfallen rock and débris from the hillside as to be impassable...
Gerard Fowke 「Archeological Investigations」
...He realizesthe impassable gulf that is for ever fixed between himself and that!And this sudden revelation tells him his level...
Anthony M. Ludovici 「Nietzsche and Art」
...The Lady of the Lake took the child to her own home, which was an island in the middle of the sea and surrounded by impassable walls...
Thomas Wentworth Higginson 「Tales of the Enchanted Islands of the Atlantic」
...He crept closer, and, circling the house, sawthat an almost impassable road led to it from the rear...
Various 「Astounding Stories, March, 1931」
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