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lethargy

leth·ar·gy [ léthərjee ]


noun 
Definition:
 
1. tiredness: a state of physical slowness and mental dullness resulting from tiredness, disease, or drugs

2. lack of energy: lack of energy, activity, or enthusiasm

[14th century. Via French< late Latin lethargia< Greek lēthargia< lēthargos "forgetful" < lēthē "forgetfulness"]
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