uncrossable

adj

1. Impossible to cross.

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

   “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.””

   “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.”

   “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.”