INDOLENT INDIFFERENCE!!
In doing my usual macabre research on depression. I ran across the phrase indolent indifference.  Somehow I knew this had special meaning with regard to anhedonia, so I looked up the individual words, to gain a clear understanding of the state of mind being conveyed by the description.  Here are the dictionary definitions, and how I feel it with regard to my anhedonic state.
indolent

Main Entry: in·do·lent Pronunciation: \-lənt\Function: adjective Etymology: Late Latin indolent-, indolens insensitive to pain, from Latin in- + dolent-, dolens, present participle of dolēre to feel painDate: 16631 a : causing little or no pain b : slow to develop or heal 2 a : averse to activity, effort, or movement : habitually lazy b : conducive to or encouraging laziness c : exhibiting indolence synonyms see lazy— in·do·lent·ly adverb

via indolent – Definition from the Merriam-Webster Online Dictionary.

Main Entry: in·dif·fer·ence
Pronunciation: \in-ˈdi-fərn(t)s, -f(ə-)rən(t)s\
Function: noun
1 : the quality, state, or fact of being indifferent
2 a archaic : lack of difference or distinction between two or more things b : absence of compulsion to or toward one thing or another 

“ averse to activity, effort, or movement ” with “absence of compulsion to or toward one thing or another”

“I don’t care.”  “Whatever”  The mantras of the Anhedonic…>;