earnestly, or with all diligence, or to seek something that is very much desired (see Molina)
Alonso de Molina:
tetlamatataquiliztica. ahincadamente, o con toda diligencia. s. procura alguna cosa que mucho desea. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 108v. col. 1. Thanks to Joe Campbell for providing the transcription.