application, assiduity, assiduousness, backbone, balls, bottom, bulldog tenacity, chutzpah, cohesiveness, concentration, constancy, courage, decisiveness, diligence, dogged perseverance, doggedness, durability, endurance, energy, engrossment, fidelity, force, fortitude, gameness, grit, guts, gutsiness, guttiness, hardiness, hardness, heart, heart of oak, heartiness, indefatigability, indomitability, industriousness, industry, infrangibility, insistence, insistency, intestinal fortitude, lastingness, leatherlikeness, loyalty, lustihood, lustiness, mettle, mettlesomeness, might, mightiness, moxie, nerve, obstinacy, patience, patience of Job, permanence, perseverance, persistence, persistency, pertinaciousness, pertinacity, pith, plodding, pluck, pluckiness, plugging, potency, power, powerfulness, preoccupation, relentlessness, resistance, resolution, robustness, ropiness, ruggedness, sand, sedulity, sedulousness, single-mindedness, singleness of purpose, slogging, spirit, spunk, spunkiness, stability, stalwartness, starch, staunchness, staying power, steadfastness, steadiness, stick-to-itiveness, sticking power, stiffness, stout heart, stoutness, strength, strength of will, stringiness, stubbornness, sturdiness, tenaciousness, tenacity, tirelessness, toleration, toughness, true grit, unbreakability, unbreakableness, unremittingness, unswerving attention, vigor, vigorousness, viscidity, vitality
perseverance, continuance, permanence, firmness, constancy, steadiness, singleness of purpose, tenacity of purpose, persistence, plodding, patience, sedulity, pertinacy, pertinacity, pertinaciousness, iteration, bottom, game, pluck, stamina
, backbone, grit, indefatigability, indefatigableness, bulldog courage, persevering, constant, steady, steadfast, undeviating, unwavering, unfaltering, unswerving, unflinching, unsleeping, unflagging, undrooping, steady as time, unrelenting, unintermitting, unremitting, plodding, industrious, strenuous, pertinacious, persisting, persistent, solid, sturdy, staunch, stanch, true to oneself, unchangeable, unconquerable, indomitable, game to the last, indefatigable, untiring, unwearied, never tiring, through evil report and good report, through thick and thin, through fire and water, per fas et nefas, without fail, sink or swim, at any price, vogue la galere, never say die, give it the old college try, vestigia nulla retrorsum, aut vincer aut mori, la garde meurt et ne se rend pas, tout vient a temps pour qui sait attendre.
strength, power, energy, vigor, force, main force, physical force, brute force, spring, elasticity, tone, tension, tonicity, stoutness, lustihood, stamina
, nerve, muscle, sinew, thews and sinews, physique, pith, pithiness, virtility, vitality, athletics, athleticism, gymnastics, feats of strength, adamant, steel, iron, oak, heart of oak, iron grip, grit, bone, athlete, gymnast, acrobat, superman, Atlas, Hercules, Antaeus, Samson, Cyclops, Goliath, tower of strength, giant refreshed, strengthening, invigoration, refreshment, refocillation, dynamics, statics, strong, mighty, vigorous, forcible, hard, adamantine, stout, robust, sturdy, hardy, powerful, potent, puissant, valid, resistless, irresistible, invincible, proof against, impregnable, unconquerable, indomitable, dominating, inextinguishable, unquenchable, incontestable, more than a match for, overpowering, overwhelming, all powerful, all sufficient, sovereign, able-bodied, athletic, Herculean, Cyclopean, Atlantean, muscular, brawny, wiry, well-knit, broad-shouldered, sinewy, strapping, stalwart, gigantic, manly, man-like, manful, masculine, male, virile, unweakened, unallayed, unwithered, unshaken, unworn, unexhausted, in full force, in full swing, in the plenitude of power, stubborn, thick-ribbed, made of iron, deep-rooted, strong as a lion, strong as a horse, strong as an ox, strong as brandy, sound as a roach, in fine feather, in high feather, built like a brick shithouse, like a giant refreshed, strongly, by force, by main force, our withers are unwrung, Blut und Eisen, coelitus mihi vires, du fort au diable, en habiles gens, ex vi termini, flecti non frangi, he that wrestles with us strengthens our nerves an, inflexible in faith invincible in arms.