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"
not to be placated or appeased or moved by entreaty
"Russia's final hour, it seemed, approached with inexorable certainty"
"the stern demands of parenthood"