indocibilis

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.

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.