Meaning of “lethargic” in the English Dictionary

"lethargic" in British English

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lethargicadjective

uk /ləˈθɑː.dʒɪk/ us /-ˈθɑːr-/

having little energy; feeling unwilling and unable to do anything:

I was feeling tired and lethargic.

(Definition of “lethargic” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"lethargic" in American English

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lethargicadjective

us /ləˈθɑr·dʒɪk/

lacking in energy; feeling unwilling or unable to do anything

lethargy
noun [ U ] us /ˈleθ·ər·dʒi/

(Definition of “lethargic” from the Cambridge Academic Content Dictionary © Cambridge University Press)