indefinite pronoun A pronoun that does not refer to a particular person or object. Examples: Singular—anybody, anyone, each, everyone, everything, somebody, something, neither, none, or nobody; Plural—few, many, and several; Singular or plural—all, most, and some.
In formal writing, an indefinite pronoun usually refers to a single person or object and agrees with a singular verb.
If an indefinite pronoun such as all, none, or some refers to a plural noun, use a plural form of the verb. If it refers to a singular noun, use a singular form.