UNTRAVERSABLE • E-FREE TRANSLATION.COM • Definition of Untraversable

... world.[478] For while the argument from the earth's rotundity was intelligible enough, there were few to whom, as to Toscanelli, it was a living truth. Even of those who admitted, in theory, that Cathay lay to the west of Europe, most deemed the distance untraversable. Inductive proof of the existence of accessible land to the west was thus what Columbus chiefly needed, and what he sought every opportunity to find and produce; but it was not easy to find anything more substantial ...

— The Discovery of America Vol. 1 (of 2) - with some account of Ancient America and the Spanish Conquest • John Fiske