† oˈstentful,a.Obs. [f. ostent n.1 + -ful.] Full of omen; portentous, ominous. 1608Chapman Byron's Trag. Plays 1873 II. 281 All then together are indeed ostentfull.1615― Odyss. xv. 214 If this ostentful thing (This eagle, and this goose) touch us, or you.