The Collaborative International Dictionary of English v.0.48:

balanced \bal"anced\ adj.
   being in a state of proper balance or equilibrium; --
   opposite of unbalanced. the carefully balanced seesaw a
   properly balanced symphony orchestra a balanced assessment of
   intellectual and cultural history a balanced blend of
   whiskeys the educated man shows a balanced development of all
   his powers [Narrower terms: counterbalanced,
   counter-balanced, counterpoised; well-balanced; poised]
   [Related terms: stable --- (maintaining equilibrium)]
   [WordNet 1.5]