anhedonia

[,ænhi'doniə]

anhedonia (n.): "inability to feel pleasure," 1897, from French anhédonie, coined 1896 by French psychologist Theodule Ribot (1839-1916) as an opposite to analgesia, from Greek an-, privative prefix (see an- (1)), + hedone "pleasure" (see hedonist) + abstract noun ending -ia.