The Collaborative International Dictionary
Innavigably
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.