inexorable

adjectives

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"

grim, inexorable, relentless, stern, unappeasable, unforgiving, unrelenting

is derived from

inexorableness

is derived from

inexorability

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"

adamant, adamantine, inexorable, intransigent

is derived from

inexorableness