Lewis Short
(adjective) : in-faustus, a, um
* Unfortunate, unpropitious (poet. and post-Aug.): infaustas exurite puppes,Verg. A. 5, 635: nomen,id. ib. 7, 717: auspicium,id. ib. 11, 347: gradus,Ov. M. 3, 36: dies,Tac. H. 2, 91: castra,id. A. 1, 30.—Neutr. subst.: in-faustum, i, n., a misfortune: infausto Atheniensium,Plin. 16, 36, 66, § 169.—Adv.: infaustē, unfortunately (late Lat.), Cassiod. An. 12.
Charlton T. Lewis, Charles Short, A Latin Dictionary