lack of interest or concern

We were shocked by their indifference toward poverty.

unimportance; little or no concern

Whether or not to attend the party is a matter of indifference to him.

the quality or condition of being indifferent.

mediocre quality; mediocrity.

noun

caring , compassion , concern , feeling , interest , involvement , regard , sympathy

noun

alienation , aloofness , apathy , callousness , carelessness , cold-bloodedness , coldness , cold shoulder * , coolness , detachment , disdain , disinterest , disinterestedness , dispassion , disregard , equity , heedlessness , immunity , impartiality , impassiveness , impassivity , inattention , inertia , insensitivity , insouciance , isolationism , lack , lethargy , listlessness , negligence , neutrality , nonchalance , noninterference , objectivity , stoicism , torpor , unconcern , unmindfulness , inconsequence , inconsequentiality , inconsequentialness , insignificance , insignificancy , unimportance , incuriosity , incuriousness , insensibility , insensibleness , lassitude , phlegm , stolidity , stolidness , uninterest , unresponsiveness , acedia , agnosticism , iciness , inappetency , inferiority , languor , mediocrity , minauderie , pococurantism , sangfroid , supineness