unnavigable

• unnavigatable

From un- +‎ navigable.

unnavigable (comparative more unnavigable, superlative most unnavigable)

1. Not navigable. Difficult or impossible to navigate.

   unnavigable website

   1. (nautical) impossible to sail through
      • 1950 May, Timothy H. Cobb, “The Tanganyika Railway”, in Railway Magazine, page 298:

        A road journey of 70 miles past unnavigable rapids leads to Juba, from which it is seven days' steaming down river through to Kosti, on the Sudan Railways.

   2. (of a path, trail, or route) that cannot be used for any reason.

      The trail was unnavigable since the flood washed it away.

• innavigable