Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-dŏcĭbĭlis, e, adj. [2. in-doceo], unteachable (late Lat.), Vulg. Interpr. Iren. 4, 28; Ambros. in Psa. 47, § 21 fin.: indocibilis, δυσμαθής, Gloss. Philox.