Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ĭn-ausus, a, um, adj., not ventured, unattempted (poet. and in post-Aug. prose): ne quid inausum Aut intractatum scelerisve dolive fuisset, Verg. A. 8, 205: nefas, Val. Fl. 1, 807: quid enim per hosce dies inausum intemeratumve vobis? Tac. A. 1, 42: sciat animus nihil inausum esse fortunae, Sen. Ep. 91 med.
Plur. as subst.: ĭn-ausa, ōrum, n., unattempted things, deeds beyond daring: quae inausa audeat, Sen. Thyest. 20.