activity, animation, animus, aptitude, ardor, backbone, bent, bias, bottom, brio, briskness, cast, character, chutzpah, constitution, courage, dauntlessness, diathesis, disposition, eccentricity, elan, enthusiasm, gameness, glow, grain, grit, gusto, guts, gutsiness, guttiness, heart, heart of oak, idiosyncrasy, impetuosity, impetus, inclination, individualism, intestinal fortitude, joie de vivre, kidney, leaning, life, liveliness, lustiness, make, makeup, mental set, mettlesomeness, mind, mind-set, mold, moxie, nature, nerve, perkiness, pertness, pith, pluck, pluckiness, predilection, predisposition, preference, proclivity, propensity, resolution, robustness, set, slant, spirit, spiritedness, spunk, spunkiness, stamina, stamp, stout heart, strain, streak, stripe, temper, temperament, tendency, toughness, true grit, turn, turn of mind, twist, type, vivacity, warmth, warp, zest, zestfulness