comˈpassion faˌtigue BrE AmE noun [uncountable]
if you are suffering from compassion fatigue, you have stopped feeling sympathy for people and do not want to give any more money to help them, because you have seen so many reports on television, in newspapers etc about other groups of people who are in trouble:
Some donors, battered by so many appeals for help, may find themselves battling compassion fatigue.