vivacity
n.
early 15c., "liveliness, vigor," from Old French vivacite or directly from Latin vivacitatem (nominative vivacitas) "vital force, liveliness," from vivax (genitive vivacis) "lively," also "long-lived," from vivere "to live" (see vital).
〔蒋〕[viv活，-acity名词后缀，表示情况、状态] 活泼，有生气