the act of becoming hardened and obstinate in bad things (see Molina)
Orthographic Variants:
yollotlaquactiliztl
Alonso de Molina:
yollotlaquactiliztli. dureza assi. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 40v. col. 2. Thanks to Joe Campbell for providing the transcription.