SYN
application, assiduity, assiduousness, balkiness, bigotry, bulldog courage, bulldog tenacity, bullheadedness, concentration, constancy, demandingness, determination, diligence, doggedness, dogged perseverance, dogmatism, endurance, engrossment, exigency, fanaticism, fidelity, fixed mind, fortitude, gameness, gaminess, grittiness, hardheadedness, hardihood, hardiness, headstrongness, importunacy, importunateness, importunity, indefatigability, industriousness, industry, inflexible will, insistence, insistency, intolerance, loyalty, mettlesomeness, mulishness, nerviness, obduracy, obstinacy, obstinateness, opinionatedness, overzealousness, patience, patience of Job, permanence, perseverance, persistence, persistency, pertinaciousness, pigheadedness, plodding, pluckiness, plugging, preoccupation, pressingness, pressure, relentlessness, resoluteness, resolution, restiveness, sedulity, sedulousness, self-will, single-mindedness, singleness of purpose, slogging, spunkiness, stability, stamina, staying power, steadfastness, steadiness, stick-to-itiveness, stiff-neckedness, stiff neck, strongheadness, stubbornness, sulkiness, sullenness, tenaciousness, tenacity, tirelessness, uncooperativeness, unregenerateness, unremittingness, unswerving attention, urgency, willfulness,