innavigable

From Latin innāvigābilis.^[1] By surface analysis, in- +‎ navigable.

innavigable (comparative more innavigable, superlative most innavigable)

1. Incapable of being navigated; impassable by ships etc.
   • 1697, Virgil, “The Sixth Book of the Æneis”, in John Dryden, transl., The Works of Virgil: Containing His Pastorals, Georgics, and Æneis. […], London: […] Jacob Tonson, […], →OCLC, page 368, lines 204–205:

     If you ſo hard a Toil will undertake, / As twice to paſs th’ innavigable Lake; […]

• unnavigable

• innavigably

• “innavigable”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.

innavigable f (plural innavigables)

1. innavigable

• “innavigable”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.