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forceful, forcefully, forte, gutsy, hale, hard, hardy, heady, healthful, healthy, hearty, heavily, heavy, hefty, high, husky, illiquid, intense, intensely, lusty, massive, massy, molar, nappy, nervy, obstreperous, passionately, portly, positive, potent, powerful, powerfully, properly, rank, recalcitrant, refractory, reliable, reluctant, resistant, resistive, restive, robust, robustly, rooted, safe, salubrious, salutary, sanguine, secure, sinewy, solid, solid-state, sound, soundly, stable, stalwart, stanch, stark, steadfast, steady, sterling, stiff, stout, strong, strong-willed, strongly, strongman, stubborn, sturdy, substantial, sure, sureness, swingeing, tightly, tough, toughly, trusty, undoubted, unimpeachable, unquestionable, upstanding, valid, vehement, violent, virile, virtual, wholesome, wiry