† ˈimprobous,a.Obs.rare. [f. L. improb-us or F. improbe + -ous] Wicked, unprincipled. Hence † ˈimprobouslyadv., wickedly; violently. 1657Tomlinson Renou's Disp. 295 One [nettle] whose leaves are improbously mordacious.Ibid. 596 Alas! the improbous do so impose upon us.