docile, or one who can be indoctrinated, educated (see Molina)
Alonso de Molina:
machtiloni. docil o doctrinable. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 50v. col. 2. Thanks to Joe Campbell for providing the transcription.