tenacious, determined, resolute, resolved, purposeful, persistent, persevering, pertinacious, relentless, intent, dead set, single-minded, focused, dedicated, committed, undeviating, unshakeable, unflagging, indefatigable, untiring, never-tiring, tireless, unfailing, unfaltering, unwavering, unyielding, unbending, immovable, obdurate, strong-willed, firm, steadfast, steady, staunch, stout-hearted
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