/ ˈleθədʒi; NAmE ˈleθərdʒi/ noun
[ U ] the state of not having any energy or enthusiasm for doing things
SYN listlessness , inertia
► leth·ar·gic / ləˈθɑːdʒɪk; NAmE -ˈθɑːrdʒ-/ adjective :
The weather made her lethargic.
••
WORD ORIGIN
late Middle English : via Old French from late Latin lethargia , from Greek lēthargia , from lēthargos forgetful, from the base of lanthanesthai forget.