persistency, persistence, pertinacity, tenaciousness, doggedness, perseverence, tenacy, pertinacy, persistiveness, untenacity, more...

fragility, weakness, feebleness, vulnerability

persistence, perseverance, stick-to-it-iveness, stick-to-itiveness, more...

great, such, remarkable, high, extraordinary, more, considerable, dogged, utmost, wonderful, equal

sticking to it,   unyielding quality,   refusal to give up,   blind determination,   great determination,   strong perseverance,   stubborn survival,   stubborn hope