unyielding

unyielding adjective adamant, adamantine, decided, dedicated, determined, devoted, enduring, faithful, firm, fixed, hard, headstrong, immobile, impliant, indomitable, inductile, inexorable, inflexible, intractable, intransigent, invariable, obdurate, obstinate, opinionated, perseverant, persevering, persistent, perverse, pervicacious, recalcitrant, refractory, renitent, resisting, resolute, resolved, rigid, set, settled, solid, stable, stanch, steadfast, steady, stern, stiff, strong, stubborn, tenacious, tough, true, unchangeable, uncompromising, uncontrollable, undeviating, ungovernable, unimpressible, unmanageable, unpliable, unwavering, wayward, zealous

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See also: barren, callous, chronic, compact, devoted, disobedient, dogmatic, durable, fanatical, firm, formidable, froward, immutable, impervious, implacable, impossible, indelible, indestructible, indomitable, industrious, inexorable, inexpugnable, infallible, inflexible, insusceptible, intractable, invincible, ironclad, irreconcilable, obdurate, oppressive, parsimonious, particular, patient, permanent, persistent, pertinacious, perverse, recalcitrant, relentless, resolute, restive, rigid, sedulous, serious, severe, solid, stable, staunch, steadfast, strict, stringent, strong, unaffected, unalterable, unbending, uncompromising, unmitigated, unproductive, unrelenting, unruly, willful