impenetrable |
unnavigable |
As adjectives the difference between impenetrable and unnavigable
is that
impenetrable is impenetrable while
unnavigable is (nautical) not navigable; impossible to sail through.
unnavigable |
innavigable |
As adjectives the difference between unnavigable and innavigable
is that
unnavigable is not navigable; impossible to sail through while
innavigable is incapable of being navigated; impassable by ships etc.
unnavigable |
unnavigability |
As an adjective unnavigable
is (nautical) not navigable; impossible to sail through.
As a noun unnavigability is
the quality of being unnavigable.