sprightly [ˈspraɪtli]

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adj.愉快的，活泼的

( especially of old people ) energetic and in good health

She is as sprightly as a woman half her age. 她跟比她年轻一半的妇女一样活泼。
He's surprisingly sprightly for an old man. 他这把年纪了，还这么精神，真了不起。