a coward, or a person lacking enthusiasm (see Molina)
Orthographic Variants:
aoquich yullo
Alonso de Molina:
aoquich yullo. couarde, o de poco animo. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 6v. col. 2. Thanks to Joe Campbell for providing the transcription.