invius

• (Classical Latin) IPA^(key): /ˈin.u̯i.us/, [ˈɪnu̯iʊs̠]
• (modern Italianate Ecclesiastical) IPA^(key): /ˈin.vi.us/, [ˈiɱvius]

invius (feminine invia, neuter invium); first/second-declension adjective

1. impassable, inaccessible, impenetrable
2. trackless, pathless, without a road or way through
   • 29 BCE – 19 BCE, Virgil, Aeneid 4.151:

     Postquam altōs ventum in montīs atque invia lustra, [...].

     After they came to the mountain heights and pathless forest lairs [of prey], [...].

First/second-declension adjective.

• “invius”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• “invius”, in Charlton T. Lewis (1891) An Elementary Latin Dictionary, New York: Harper & Brothers
• invius in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• invius in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette.