inexorable \in-EK-sur-uh-bul; in-EKS-ruh-bul\ (adjective) - Not to be persuaded or moved by entreaty or prayer; firm; determined; unyielding; unchangeable; inflexible; relentless.
"As he watched -- with a sense of seeing inexorable, inevitable movement which made everything seem to slow down to an unbearable slowness -- the little weapons carrier stopped, Musso unwound his long legs out of the seat well and got out, came walking over toward him." -- James Jones, 'The Pistol'
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Inexorable comes from Latin inexorabilis, from in-, "not" + exorabilis, "able to be entreated, placable," from exorare, "to entreat successfully, to prevail upon," from ex-, intensive prefix + orare, "to speak; to argue; to pray."