Play"ful*ness

from The Collaborative International Dictionary of English v.0.48

Playful \Play"ful\, a.
   Sportive; gamboling; frolicsome; indulging a sportive fancy;
   humorous; merry; as, a playful child; a playful writer. --
   {Play"ful*ly}, adv. -- {Play"ful*ness}, n.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

58 Moby Thesaurus words for "playfulness":
      animal spirits, animation, capersomeness, coltishness,
      devilishness, devilment, devilry, deviltry, elan, elfishness,
      esprit, exuberance, flippancy, foolishness, friskiness, frivolity,
      frolicsomeness, gaiety, gamesomeness, gayness, gusto, heartiness,
      high spirits, impishness, levity, life, liveliness, merriment,
      mischief, mischievousness, piss and vinegar, prankishness,
      pranksomeness, puckishness, roguery, roguishness, rollicksomeness,
      rompishness, scampishness, skittishness, spirit, spiritedness,
      spirits, sportiveness, sprightliness, trickery, trickiness, verve,
      vigor, vim, vitality, vivacity, waggery, waggishness,
      youthful spirits, zest, zestfulness, zip