icnopillaueliloc. ingrato. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 33r. col. 2. Thanks to Joe Campbell for providing the transcription.
Frances Karttunen:
(I)CNŌPILLAHUĒLĪLŌC someone ungrateful / ingrato (M) [(2)Cf. 58V]. See (I)CNŌPIL-LI, TLAHUĒLĪLŌC. Frances Karttunen, An Analytical Dictionary of Nahuatl (Norman: University of Oklahoma Press, 1992), 94.