languor [ˈlæŋgə(r)]

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n.无精力，倦怠

pleasant mental or physical tiredness or lack of activity

It was hot, yet with a sweet languor about it. 天气是炎热的，然而却有一种惬意的懒洋洋的感觉。
She, in her languor, had not troubled to eat much. 她懒懒的，没吃多少东西。