Source : Webster's Revised Unabridged Dictionary (1913)

Sportive \Sport"ive\, a.
   Tending to, engaged in, or provocate of, sport; gay;
   froliscome; playful; merry.

         Is it I That drive thee from the sportive court?
                                                  --Shak.
   -- {Sport"ive*ly}, adv. -- {Sport"ive*ness}, n.

Source : WordNet®

sportiveness
     n : lively high-spirited playfulness [syn: {friskiness}, {frolicsomeness}]