uncrossable

From un- +‎ crossable.

uncrossable (comparative more uncrossable, superlative most uncrossable)

1. Impossible to cross.
   • 1999, Robert D. Abbott, The World as Information: Overload and Personal Design‎^[1], →ISBN, page 38:

     There is what appears under normal circumstances to be an uncrossable boundary, a total barrier.

   • 2009 August 16, Max Byrd, “Rosie and Friends”, in New York Times‎^[2]:

     And it’s brilliantly stitched together by motifs of chrysalises and movies and by a joyous abundance of metaphor and simile: “the ding of a bicycle bell like struck crystal”; a woman “talking for much of the day in a steady soft uncrossable stream.”

   • 2009 August 24, Rita Campbell, “Father and young son die in loch tragedy”, in The Press and Journal‎^[3]:

     There are very few bridges on the footpaths in Skye and even short periods of heavy rain can cause rivers to rise rapidly, often making them uncrossable.

   • 2012, Andrew Martin, Underground Overground: A passenger's history of the Tube, Profile Books, →ISBN, page 50:

     There are two Underground stations. That serving the District and Piccadilly is on one side of an uncrossable road called Hammersmith Broadway; that serving the Hammersmith & City is on the other side. Whichever exit you emerge from, at whichever station, you are immediately lost.