Similar word to mettle:

animation, ardor, backbone, bravery, caliber, courage, daring, dauntlessness, disposition, energy, fire, force, fortitude, gallantry, gameness, grit, guts, hardihood, heart, indomitability, kidney, life, makeup, moxie, nature, nerve, pluck, quality, resolution, resolve, spirit, spunk, stamina, stamp, starch, temper, temperament, valor, vigor, vitality


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