See obdurate in Webster's New World Roget's A-Z Thesaurus II
adjective
Completely lacking in compassion:
callous, cold-blooded, cold-hearted, compassionless, hard, hard-boiled, hardened, hardhearted, heartless, stonyhearted, unfeeling. See attitudeFirmly, often unreasonably immovable in purpose or will:
adamant, adamantine, brassbound, die-hard, grim, implacable, incompliant, inexorable, inflexible, intransigent, iron, relentless, remorseless, rigid, stubborn, unbendable, unbending, uncompliant, uncompromising, unrelenting, unyielding. Idiom: stubborn as a mule (or ox). See resist
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