In*dif"fer*ent*ism (?), n. [Cf. F. indifférentisme.]

1. State of indifference; want of interest or earnestness; especially, a systematic apathy regarding what is true or false in religion or philosophy; agnosticism.

The indifferentism which equalizes all religions and gives equal rights to truth and error.

2. (Metaph.) Same as Identism.

3. (R. C. Ch.) A heresy consisting in an unconcern for any particular creed, provided the morals be right and good. Gregory XVI.