Indifference—refers to a soul crushing combination of social alienation (mentioned above) with profound apathy to one’s place in the social world. Indifference resembles anhedonia in that one sees no real/authentic possibilities for joy— only possibilities for pretending that joy can be manufactured through appearances.
Indifference is analytically distinct from anhedonia in that the person who is extremely apathetic and resigned still feels in control of others’ perceptions of them. The indifferent person can still create the illusion of being happy and capable of experiencing joy—anhedonia is a loss of such control; the person experiencing anhedonia wears his/her despair openly—indifference relies on the ability to “fake it.”