Definition of lethargy noun from the Oxford Advanced Learner's Dictionary

 

lethargy

 noun
noun
BrE BrE//ˈleθədʒi//
 
; NAmE NAmE//ˈleθərdʒi//
 
[uncountable]
 
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the state of not having any energy or enthusiasm for doing things synonym listlessness, inertia The report criticizes the lethargy shown by employers when it comes to job creation. Word Origin late Middle English: via Old French from late Latin lethargia, from Greek lēthargia, from lēthargos ‘forgetful’, from the base of lanthanesthai ‘forget’.Extra examples He felt that he had to drag himself out of his lethargy and begin to write. She was suddenly overcome by lethargy. They will need to shake off their lethargy if they want to win the game.
See the Oxford Advanced American Dictionary entry: lethargy