to not be persuaded or relocated by entreaty or prayer; unyielding; unrelenting: because, an inexorable creditor; inexorable law.
Synonyms Inexorable, Unrelenting, Relentless, Implacable; immovable. Inexorable, literally not to be relocated or changed by prayer or petition, expresses an immovable tone in declining to-do what a person is entreated to do, whether that be great or bad; it's also used figuratively: since, inexorable demise, time, fate. Another three terms connect with feeling, which is typically bad, but unrelenting and relentless may by figure use and also to activity: since, an unrelenting pursuit; a relentless massacre. Implacable pertains wholly to feeling, indicating unappeasable, plus this usage is the best of the three; it matches such strong words as animosity and resentment.