indifferentism

Noun

in=dif=fer=ent=ism

CIDE DICTIONARY

indifferentism, n. [Cf. F. indifférentisme.].

State of indifference; lack of interest or earnestness; especially, a systematic apathy regarding what is true or false in religion or philosophy; agnosticism. [1913 Webster]
"The indifferentism which equalizes all religions and gives equal rights to truth and error." [1913 Webster]
Same as Identism. [1913 Webster]
A heresy consisting in an unconcern for any particular creed, provided the morals be right and good. Gregory XVI. [1913 Webster]

indifferentism, n. an attitude of indifference, esp. in religious matters.

Derivative

indifferentist n.

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