Neither is most often an adjective meaning "not one or the other of two people or things."

What type of adjective is neither?

There are four distributive adjectives in English: each, every, either and neither. Distributive adjectives are used with singular nouns. The following verb is usually singular, but can be plural in a very formal style.

Is neither an adjective or a pronoun?

As an adjective or pronoun meaning “not either,” neither is usually followed by a singular verb and referred to by a singular personal pronoun: Neither lawyer prepares her own briefs.