Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
subsĕquus or subsĭcŭus, a, um, adj. [subsequor], following, succeeding (late Lat.); form subsequus: probatio, Oros. 1, 1; form subsicuus: metus, Jul. Val. Rer. Gest. Alex. 2, 21 fin.
subsĭcŭus, a, um, v. subsequus.