I.very old, decrepit (mostly ante-class.): “vetulus, decrepitus senex,” Plaut. Merc. 2, 2, 43; so, “senex,” id. ib. 20; id. Asin. 5, 2, 13; Ter. Ad. 5, 8, 16: “senex,” Vulg. 2 Par. 36, 17: “leo,” Prud. Ham. 561: “inter decrepitos me numera et extrema languentes,” Sen. Ep. 26: aetas (bestiolae), * Cic. Tusc. 1, 39 fin.
dē-crĕpĭtus , a, um, adj. crepo (lit., noiseless; applied to old people, who creep about like shadows),