Synonyms and related words :
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