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What is Mettle?

met·tle/ˈmedl/noun

a person's ability to cope well with difficulties or to face a demanding situation in a spirited and resilient way.
"the team showed their true mettle in the second half"
synonyms:spirit, fortitude, tenacity, strength of character, moral fiber, steel, determination, resolve, resolution, steadfastness, indomitability, backbone, hardihood, pluck, nerve, gameness, courage, courageousness, bravery, gallantry, valor, intrepidity, fearlessness, boldness, daring, audacity;