See unyielding in Webster's New World Roget's A-Z Thesaurus II
adjective
Not changing shape or bending:
inelastic, inflexible, rigid, stiff, unbending. See flexibleIndicating or possessing determination, resolution, or persistence:
constant, determined, firm1, resolute, steadfast, steady, stiff, tough, unbending, uncompromising, unflinching, unwavering. See purposeRigorous and unsparing in treating others:
demanding, exacting, hard, harsh, rigid, severe, stern, strict, tough. See easyFirmly, often unreasonably immovable in purpose or will:
adamant, adamantine, brassbound, die-hard, grim, implacable, incompliant, inexorable, inflexible, intransigent, iron, obdurate, relentless, remorseless, rigid, stubborn, unbendable, unbending, uncompliant, uncompromising, unrelenting. Idiom: stubborn as a mule (or ox). See resist
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