inexorable

When a person is inexorable, they're stubborn. When a thing or process is inexorable, it can't be stopped.

This is a word for people and things that will not change direction. An inexorable person is hard-headed and cannot be convinced to change their mind, no matter what. You can also say that a process, like the progress of a deadly illness, is inexorable because it can't be stopped. A speeding train with no brakes is inexorable; it's not stopping till it crashes. When you see the word inexorable, think "No one's stopping that."

Definitions of inexorable
  1. adjective
    not to be placated or appeased or moved by entreaty
    “Russia's final hour, it seemed, approached with inexorable certainty”
    synonyms: grim, relentless, stern, unappeasable, unforgiving, unrelenting
    implacable
    incapable of being placated
  2. adjective
    impervious to pleas, persuasion, requests, reason
    “Cynthia was inexorable
    synonyms: adamant, adamantine, intransigent
    inflexible
    incapable of change
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