"inexorable" in the adjective sense
1. grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting
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"
2. adamant, adamantine, inexorable, intransigent
impervious to pleas, persuasion, requests, reason she would have none of him"- W.Churchill
"he is adamant in his refusal to change his mind"
"Cynthia was inexorable
"an intransigent conservative opposed to every liberal tendency"
Source: WordNet® (An amazing lexical database of English)
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