Adjective
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impervious to pleas, persuasion, requests, reason
"he is adamant in his refusal to change his mind"
"Cynthia was inexorable
she would have none of him"- W.Churchill
"an intransigent conservative opposed to every liberal tendency"
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not to be placated or appeased or moved by entreaty
"grim determination"
"grim necessity"
"Russia's final hour, it seemed, approached with inexorable certainty"
"relentless persecution"
"the stern demands of parenthood"