GRIT

n. courage, courageousness, valour, bravery, fortitude, resolution, resoluteness, resolve, toughness, mettle, pluck, spirit, backbone, nerve, gameness, intrepidity or intrepidness, dauntlessness, tenacity, determination, firmness, hardiness, hardihood, staunchness, stalwartness, doughtiness, fearlessness, Colloq guts, gutsiness, spunk, spunkiness, starch, Brit bottle, US and Canadian chutzpah, moxie, stick-to-it-iveness Mountain-climbing requires more grit than you might think