1) to be idle, without profit; in vain, futile (see Karttunen); 2) to have lived (see attestations in English)
"nenque...as Karttunen points out, this adverbial contrasts phonemically with the preterit form of the verb nemi 'to live,' which is nen-, only by vowel length, which is not marked in this manuscript. Since in all four occurrences nenca is the only verb option in the phrase and clearly is not functioning adverbially, the more valid contextual choice must be 'they lived.'"
notecitzin ytoca Ana Necaciuatl = mi madre [sic pro: cuñada], llamada Ana Nencasiguatl (Santa Bárbara)