Adjective mettlesome has 2 senses
  1. mettlesome - having a proud and unbroken spirit
    Antonym:
    spiritless (indirect, via spirited)
  2. game, gamy, gamey, gritty, mettlesome, spirited, spunky - willing to face danger
    Antonyms: cowardly, fearful (indirect, via brave)
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