List of mettlesome synonyms and mettlesome related words.
active, acute, aggressive, agitable, animated, beany, brisk, bulldoggish, courageous, dauntless, dynamic, edgy, emotional, emotionally unstable, energetic, enterprising, enthusiastic, eruptive, excitable, explosive, fiery, forceful, forcible, full of pep, game, gamy, go-go, gritty, gutsy, gutty, hearty, high-mettled, high-spirited, high-strung, highly emotional, impetuous, incisive, inflammable, intense, irascible, irritable, keen, kinetic, lively, living, lusty, nervous, nervy, peppery, peppy, pertinacious, perturbable, plucky, prickly, red-blooded, resolute, robust, sensitive, skittish, smacking, snappy, spanking, spirited, spiritful, spunky, startlish, strenuous, strong, take-charge, take-over, tenacious, touchy, tough, trenchant, vibrant, vigorous, vivacious, vivid, volcanic, zestful, zesty, zippy