quivis

Etymology
From.

Pronoun

 * 1) whoever you will, anyone, anything
 * 2) whatever (you will), whatsoever

Determiner

 * 1) whichever, whatever (person or thing)

Usage notes

 * The pronoun is used in place of a noun, while the determiner is used in place of an adjective (e.g. whichever man, whatever speech). The declensions differ only in the neuter nominative/accusative singular: as a pronoun,  as a determiner.