'indifferentist' originates from the Latin word 'indifferens,' where 'in-' meant 'not' and 'differens' meant 'differing.'

'indifferens' transformed into the French word 'indifférent,' and eventually became the modern English word 'indifferentist' through Middle English.

Initially, it meant 'not differing,' but over time it evolved into its current meaning of 'a person who is indifferent, especially in matters of religion or politics.'