a person who pays no attention to anyone else, takes no one else into account (see Molina)
Alonso de Molina:
aquen tlamati. el que no haze caso de nadie. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 7r. col. 2. Thanks to Joe Campbell for providing the transcription.