What does adiaphorist mean?
The definition of adiaphorist
Ad`i*aph”o*rist, n.
Etym: [See Adiaphorous.] (Eccl. Hist.)

One of the German Protestants who, with Melanchthon, held some opinions and ceremonies to be indifferent or nonessential, which Luther condemned as sinful or heretical. Murdock.