to want or wish something without reason or cause, or without purpose (see Molina)
Orthographic Variants:
iliuiznequi
Alonso de Molina:
iliuiznequi. niqu. (pret. oniquiliuiznec.) querer o dessear algo sin razon o causa, o sin proposito. Alonso de Molina, Vocabulario en lengua castellana y mexicana y mexicana y castellana, 1571, part 2, Nahuatl to Spanish, f. 37v. col. 1. Thanks to Joe Campbell for providing the transcription.