Synonyms and related words :
abiding, able-bodied, age-long, aged, ancient, antique, beefy, bold, bold-spirited, bouncing, brave, cartilaginous, chewy, chivalric, chivalrous, chronic, cohesive, constant, continuing, coriaceous, courageous, daring, deciduous, diuturnal, doughty, durable, enduring, ephemeral, evergreen, fearless, fibrous, fit, flush, forceful, forcible, forcy, full-blooded, full-strength, gallant, greathearted, gristly, gutsy, gutty, hale, hale and hearty, half-hardy, hard, hard as nails, healthy, hearty, hefty, heroic, herolike, husky, immutable, intransient, intrepid, inveterate, iron-hard, ironhearted, knightlike, knightly, lasting, leatherlike, leathery, lionhearted, long-lasting, long-lived, long-standing, long-term, longeval, longevous, lusty, macrobiotic, manful, manly, mighty, nervy, obstinate, of long duration, of long standing, perdurable, perduring, perennial, permanent, perpetual, persistent, persisting, plucky, potent, powerful, puissant, red-blooded, remaining, resistant, robust, robustious, robustuous, ropy, rude, rugged, sempervirent, sinewy, soldierlike, soldierly, sound, stable, stalwart, staying, steadfast, steely, stiff, stout, stouthearted, strapping, stringy, strong, strong as brandy, strong as strong, strong-willed, stubborn, sturdy, tenacious, tough, tough as leather, unfading, untiring, valiant, valorous, vigorous, viscid, vital, wiry