Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
subdĭtīcĭus (later -tĭus), a, um, adj. [subdo], substituted, supposititious, spurious, counterfeit (perh. only ante- and postclass., since the correct read. in Cic. Verr. 2, 5, 27, § 69, is subditivum; and in Quint. 1, 4, 3, subditos): servus, Plaut. Ps. 2, 4, 62: Antonius, Lampr. Heliog. 17; Amm. 14, 6, 15.