...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」
...During the floods, however, this cheval-de-frise of boulders must all be under water, and probably impassable...
Richard F. Burton 「Two Trips to Gorilla Land and the Cataracts of the Congo Volume 2」
...For another ship it would have been impassable,but the Roosevelt was built for this kind of work, and her worth andability had been proven on the voyage of 1905...
Matthew A. Henson 「A Negro Explorer at the North Pole」
...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」
..."The Yarrow was so large as to be quite impassable, so that I had towalk up by St...
Edward Jesse 「Anecdotes of Dogs」
...This monotonous labour continues until the Bee deems the gallery long enough, or until, as often happens, she finds herself stopped by an impassable knot...
J. Henri Fabre 「Bramble-bees and Others」
...With her large head, she makes an impassable barrier at the top of the entrance-hall...
J. Henri Fabre 「Bramble-bees and Others」
...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」
...It is time to remove the barriers, once believed impassable, which man'segotism has used as a screen to separate him from his lower brothers...
Royal Dixon 「The Human Side of Animals」
...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」
...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」
...He crept closer, and, circling the house, sawthat an almost impassable road led to it from the rear...
Various 「Astounding Stories, March, 1931」
... impassable without the shining cage!...
Various 「Astounding Stories, June, 1931」
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widow sojourn humiliation
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