unpassable

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adjective un·pass·able \ˌən-ˈpa-sə-bəl\

Definition of unpassable

  1. :  incapable of being traveled, traveled through, or crossed :  impassible … a continent of land of at least 1800 miles, in which journey we had … unpassable deserts to go over … — Daniel Defoe

First Known Use of unpassable

circa 1525


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