vivacity

n.

活泼，快活，有生气；

1. We were all affected by the vivacity of this lovely little boy.
   这个可爱的小男孩的快活使我们都受到感染。
2. He was charmed by her vivacity and high spirits.
   她的活泼与兴高采烈的情绪把他迷住了。

VivaCity: mixed-use and urban tourism.
Hume on Force and Vivacity
Force and Vivacity in the Treatise and the Enquiry
Variations on Force and Vivacity in Hume
Impressions and Ideas: Vivacity as Verisimilitude
Vivacity of a grammatical regionalism: The Burgundian "y", on va vous y expliquer
Hume on force and vivacity: a teleological-historical interpretation
On Vivacity: The Difference between Daydreaming and Imagining-Under-Authorial-Instruction
Dynamic Vivacity and Its Application to Conventional and Electrothermal-Chemical (ETC) Closed Chamber Results
The Combination of stylistic vivacity and seriousness——On the stylistic feature of Lianzhu and Lu Ji's Yan Lianzhu