1553, from L. inexorabilis "that cannot be moved by entreaty," from in- "not" + exorabilis "able to be entreated," from exorare "to prevail upon," from ex- "out" + orare "pray."
MY thoughts hold mortal strife;
I do detest my life,
And with lamenting cries
Peace to my soul to bring
Oft call that prince which here doth monarchise:
—But he, grim-grinning King,
Who caitiffs scorns, and doth the blest surprise,
Late having deck'd with beauty's rose his tomb,
Disdains to crop a weed, and will not come.
PDF: Inexorable and Inevitable: The Continuing Story of Technology and Assessment
Indianest.com: Hinduism: Karma:
Electable, Immutable, Inexorable