a weakling (see Chimalpahin); could also share the definition for yayactzin, "animal o cosa de color muy oscuro, que se acerca a negro; animal or object with a very dark color, almost black" or yayactontli, "blackish, dark"
çan yayactzintli catca amo qualxayaque yhuan çan pitzahuactzintli catca amo nacayo = she was quite weak, had not a pretty face, was quite thin, was not fleshy. (central Mexico, early seventeenth century)