obdurate

I adjective callous, cold, decided, determined, dogged, dogmatic, dogmatical, firm, hard, hardbitten, hardened, hardhearted, harsh, headstrong, heartless, immovable, immutable, impervious, impossible to influence, incorrigible, indifferent, indurate, indurated, inexorable, inflexible, insensitive, intractable, intransigent, invariable, iron-hearted, irreclaimable, merciless, mulish, obstinate, opinionated, opinionative, pertinacious, pervicacious, pig-headed, positive, recalcitrant, refractory, relentless, remorseless, resolute, stony, strong-minded, strong-willed, stubborn, tenacious, unalterable, unbending, uncaring, unchangeable, uncompassionate, uncompromising, unconcerned, uncontrollable, unfeeling, unforgiving, ungovernable, unmalleable, unmanageable, unmerciful, unpitying, unrelenting, unresponsive, unstirred, unsusceptible, unsympathetic, untouched, unyielding, willful II index callous, cold-blooded, disobedient, implacable, incorrigible, inexorable, inflexible, insusceptible (uncaring), intractable, pertinacious, recusant, relentless, remorseless, reprobate, resolute, restive, rigid, ruthless, severe, strict, unaffected (uninfluenced), unalterable, unbending, uncompromising, uncontrollable, unrelenting, unyielding, willful