application, assiduity, assiduous, assiduousness, bulldog tenacity, concentration, constancy, constant, continuing, diligence, diligent, dogged, dogged perseverance, doggedness, donkeywork, drudge, drudgery, drudging, endurance, enduring, engrossment, faithful, fidelity, grind, grinding, grubbing, hardworking, immutable, inalterable, indefatigability, indefatigable, indomitable, industrious, industriousness, industry, insistence, insistency, insistent, invincible, labor, laboring, lasting, loyal, loyalty, moil, never-tiring, obstinacy, obstinate, patience, patience of Job, patient, patient as Job, pegging, permanence, permanent, perseverance, perseverant, persevering, persistence, persistency, persistent, persisting, pertinacious, pertinaciousness, pertinacity, plodding, preoccupation, preoccupied, rapt, relentless, relentlessness, resolute, resolution, sedulity, sedulous, sedulousness, single-minded, single-mindedness, singleness of purpose, slavery, slaving, sleepless, slogging, stability, stable, stamina, staying power, steadfast, steadfastness, steadiness, steady, stick-to-itiveness, straining, striving, struggling, stubborn, stubbornness, sweating, tenacious, tenaciousness, tenacity, tireless, tirelessness, toil, toiling, unabating, unconquerable, undaunted, undiscouraged, undrooping, unfailing, unfaltering, unflagging, unflinching, unintermitting, uninterrupted, unnodding, unrelaxing, unrelenting, unremitting, unremittingness, unsleeping, unswerving, unswerving attention, untiring, unwavering, unwearied, unwearying, unwinking, utterly attentive, weariless, working