INNAVIGABLE
innavigable (in-nav-i-g<<schwa>>-b<<schwa>>l), adj.1. (Of a body of water) not capable of,
or unsuitable for, navigation. [Cases: Navigable Waters 1. C.J.S. Navigable Waters § 1.]
2.Marine insurance. (Of a vessel) unfit for service. — Also termed unnavigable.
[Blacks Law 8th]