invius adj. 2 in+via, without a road, impassable, not to be traversed, insuperable: lustra, V.: saltūs, L.: maria Teucris, V.: virtuti nulla est via, O.: nil virtuti invium, Ta.

—Plur n. as subst, impassable places: per invia iter, L.

—Inaccessible, impenetrable: regna vivis, V.: templa, O.