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lethargic

adjective
 
 
/ləˈθɑː.dʒɪk/ US  /-ˈθɑːr-/

Definition

having little energy; feeling unwilling and unable to do anything: I was feeling tired and lethargic.Tired and making tired lethargy
 
 
/ˈleθ.ə.dʒi/ US  /-ɚ-/ noun [U]
Tired and making tired
(Definition of lethargic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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