1) Activity 2) Animation 3) Brio 4) Elan 5) Energy 6) Esprit 7) Gusto 8) High spirits 9) Life 10) Merriment 11) Pep 12) Sensibility 13) Sparkle 14) Vitality 15) Zest Found on https://www.crosswordclues.com/clue/vivacity
• (n.) The quality or state of being vivacious. • (n.) Tenacity of life; vital force; natural vigor. • (n.) Life; animation; spiritedness; liveliness; sprightliness; as, the vivacity of a discourse; a lady of great vivacity; vivacity of countenance. Found on http://thinkexist.com/dictionary/meaning/vivacity/
Vi·vac'i·ty noun [ Latin vivicitas : confer French vivacité .] The quality or state of being vivacious. Specifically: -- (a) Tenacity of life; vital force; natural vigor. [ Obsolete] « The vivacity of some of these pensioners is little less than a miracle, they liv... Found on http://www.encyclo.co.uk/webster/V/32