The Collaborative International Dictionary of English v.0.48:

Gamely \Game"ly\, adv.
   In a plucky manner; spiritedly.
   [1913 Webster]

WordNet (r) 3.0 (2006):

gamely
    adv 1: in a plucky manner; "he was seen by a shepherd, gamely
           negotiating a particularly tricky section of the mountain
           road to San Doloroso"

Moby Thesaurus II by Grady Ward, 1.0:

32 Moby Thesaurus words for "gamely":
   audaciously, boldly, bravely, bulldoggishly, chivalrously,
   courageously, daringly, dauntlessly, doughtily, fearlessly,
   gallantly, gutsily, hardily, heroically, intrepidly, knightly,
   like a man, like a soldier, manfully, mettlesomely, pertinaciously,
   pluckily, resolutely, spunkily, stalwartly, stoutly, tenaciously,
   unfearfully, unfearingly, valiantly, valorously, yeomanly