The Collaborative International Dictionary of English v.0.48:
Briskness \Brisk"ness\, n. Liveliness; vigor in action; quickness; gayety; vivacity; effervescence. [1913 Webster]WordNet (r) 3.0 (2006):
briskness n 1: liveliness and eagerness; "he accepted with alacrity"; "the smartness of the pace soon exhausted him" [syn: alacrity, briskness, smartness]