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The Collaborative International Dictionary
Innavigable

Innavigable \In*nav"i*ga*ble\, a. [L. innavigabilis : cf. F. innavigable. See In- not, and Navigable.] Incapable of being navigated; impassable by ships or vessels.
--Drygen. -- In*nav"i*ga*bly, adv.

Wiktionary
innavigable

a. Incapable of being navigated; impassable by ships etc.

Usage examples of "innavigable".

Long ago it had been a thing of rapids and waterfalls, ferocious and all but innavigable for hundreds of miles.