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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.