The Collaborative International Dictionary of English v.0.48:

Frisky \Frisk"y\, a.
   Inclined to frisk; frolicsome; gay.
   [1913 Webster]

         He is too frisky for an old man.         --Jeffrey.
   [1913 Webster]

WordNet (r) 3.0 (2006):

frisky
    adj 1: playful like a lively kitten [syn: kittenish, frisky]

Moby Thesaurus II by Grady Ward, 1.0:

57 Moby Thesaurus words for "frisky":
   active, activist, activistic, alive, animated, antic, bouncing,
   bouncy, breezy, brisk, bubbly, capersome, chipper, coltish,
   ebullient, effervescent, energetic, exuberant, frolicsome,
   full of beans, full of go, full of life, full of pep, gamesome,
   gay, hearty, high-spirited, kittenish, larkish, live, lively,
   mercurial, militant, peppy, perky, pert, playful, prankish,
   quicksilver, rollicking, rollicksome, rompish, skittish, smacking,
   snappy, spanking, spirited, sportive, sprightly, spry, vital,
   vivacious, waggish, wicked, zestful, zingy, zippy