lethargic
adjective uk/ləˈθɑː.dʒɪk/ us/ləˈθɑːr.dʒɪk/
萎靡不振的，无精打采的;懒散的，倦怠的
having little energy; feeling unwilling and unable to do anything
I was feeling tired and lethargic. 我觉得浑身乏力、无精打采。
Synonyms: languorous torpid
Opposite: energetic