See mettle in Webster's New World Roget's A-Z Thesaurus II
noun
The quality of mind enabling one to face danger or hardship resolutely:
braveness, bravery, courage, courageousness, dauntlessness, doughtiness, fearlessness, fortitude, gallantry, gameness, heart, intrepidity, intrepidness, nerve, pluck, pluckiness, spirit, stoutheartedness, undauntedness, valiance, valiancy, valiantness, valor. (Informal) spunk, spunkiness. (Slang) gut (used in plural), gutsiness, moxie. See fear
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