A negindefinite pronoun is an °indefinite pronoun (or determiner) which either (i) can express °negation in isolation, or (ii) always occurs in the °scope of a °clausal negation meaning.
The term was coined (abbreviated from "negative indefinite pronoun") by Haspelmath (2025), in order to avoid the vagueness of "negative indefinite pronoun" (a term used in Haspelmath 1997, but sometimes misinterpreted).