Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
1. Actĭus, a, um, adj. poet. for Actiacus, pertaining to Actium: ludi, Verg. A. 3, 280; 8, 675; 704; Hor. Ep. 1, 18, 61; Phoebus, as having a temple at Actium (v. Actium), Prop. 4, 6, 67.
2. Actĭus, i, m., a proper name, Suet. Tib. 47.