From The Collaborative International Dictionary of English v.0.48 :
Sprightliness \Spright"li*ness\ (-l[i^]*n[e^]s), n. The quality or state of being sprightly; liveliness; life; briskness; vigor; activity; gayety; vivacity. [1913 Webster] In dreams, observe with what a sprightliness and alacrity does she [the soul] exert herself! --Addison. [1913 Webster]From WordNet (r) 3.0 (2006) :
sprightliness n 1: animation and energy in action or expression; "it was a heavy play and the actors tried in vain to give life to it" [syn: liveliness, life, spirit, sprightliness]