The Collaborative International Dictionary of English v.0.48:

High-spirited \High"-spir`it*ed\, a.
   Full of spirit or natural fire; haughty; courageous;
   impetuous; not brooking restraint or opposition.
   [1913 Webster]

WordNet (r) 3.0 (2006):

high-spirited
    adj 1: joyously unrestrained [syn: ebullient, exuberant,
           high-spirited]