The Collaborative International Dictionary of English v.0.48:

Sportive \Sport"ive\ (-[i^]v), a.
   Tending to, engaged in, or provocative of, sport; gay;
   frolicsome; playful; merry.
   [1913 Webster]

         Is it I
         That drive thee from the sportive court? --Shak.
   [1913 Webster] -- Sport"ive*ly, adv. -- Sport"ive*ness,
   n.
   [1913 Webster]

WordNet (r) 3.0 (2006):

sportive
    adj 1: relating to or interested in sports
    2: given to merry frolicking; "frolicsome students celebrated
       their graduation with parties and practical jokes" [syn:
       coltish, frolicsome, frolicky, rollicking,
       sportive]

Moby Thesaurus II by Grady Ward, 1.0:

55 Moby Thesaurus words for "sportive":
   animated, antic, arch, blithe, buoyant, capering, capersome,
   cavorting, coltish, devilish, elfish, elvish, exuberant, foolish,
   frisky, frolicsome, full of beans, full of mischief, gamesome, gay,
   gleeful, hearty, high-spirited, impish, kittenish, knavish,
   larkish, light-hearted, lively, merry, mischief-loving,
   mischievous, playful, prankish, pranksome, pranky, puckish,
   roguish, rollicking, rollicksome, rompish, scampish, scapegrace,
   skittish, spirited, sportful, sprightly, trickish, tricksy, tricky,
   vital, vivacious, waggish, zestful, zippy