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Synonyms for Mettlesome (same or very similar meaning)

WordNet sense 1 (displaying animation, vigor, or liveliness):
spirited

WordNet sense 2 (willing to face danger):
game, gamey, gamy, gritty, spunky

WordNet sense 3 (possessing or displaying courage; able to face and deal with danger or fear without flinching):
brave, courageous


From the ODE community, based on WordNetadd/edit