ˈat ə nē, -ni noun
also ato·nia əˈtōnēə, āˈ-
( plural atonies also atonias )
Etymology: Late Latin atonia, from Greek, from atonos slack, without tone (from a- a- (II) + tonos tone) + -ia -y — more at tone
1. : lack of tonus or vital energy : weakness especially of a contractile organ
2. phonetics : lack of stress or accent