ˈriverless,a. [f. river n.1 + -less.] Destitute or devoid of rivers. 1860Maury Phys.Geogr. vii. §404 That sea lies, for the most part, within a rainless and riverless district.1870Yeats Nat.Hist.Comm. 108 The region of Patagonia, riverless and hilly, is dry, cold, and barren.