I.unapproached, unapproachable, inaccessible (cf.: invius, impervius, devius, avius).
I. Lit. (poet. and post-Aug.): “mare scopulis inaccessum,” Plin. 12, 14, 30, § 52: “montes,” id. 6, 28, 32, § 144; 10, 12, 16, § 34; Flor. 3, 1, 14: “aditus,” Sil. 3, 516: “lucus,” Verg. A. 7, 11: “spelunca radiis solis,” id. ib. 8, 195.—