someone who is ill-humored, closed, who does not want people to speak to him or her (see Molina)
Alonso de Molina:
amo notzallani. mohino, dessabrido, que no quiere que alguno le hable. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 5v. col. 1. Thanks to Joe Campbell for providing the transcription.