Any one of a group of moderate Lutherans led by Phillipp Melanchthon, who advocated certain issues and ceremonies to be considered as adiaphora and not central to the Protestant faith.

A person who holds that differences of religious belief are unimportant; one who allows latitude or flexibility with regard to religious matters; an indifferentist, a latitudinarian.

Of, relating to, or of the nature of an adiaphorist or adiaphorists; that allows latitude in religious matters.