WordNet (r) 3.0 (2006):

brio
    n 1: quality of being active or spirited or alive and vigorous
         [syn: animation, spiritedness, invigoration, brio,
         vivification]

Moby Thesaurus II by Grady Ward, 1.0:

30 Moby Thesaurus words for "brio":
   activity, animation, ardor, briskness, dash, elan, enthusiasm,
   esprit, glow, gusto, impetuosity, impetus, joie de vivre, life,
   liveliness, lustiness, mettle, oomph, perkiness, pertness,
   robustness, spirit, spiritedness, verve, vim, vivacity, warmth,
   zest, zestfulness, zing