INNAVIGABLE
Source: 566, 567
innavigable. Innavigable, a. not to be failed upon, dangerous
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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.