inexorable (adj.)

"unyielding, unrelenting," 1550s, from Middle French inexorable and directly from Latin inexorabilis "that cannot be moved by entreaty, unyielding," from in- "not, opposite of" (see in- (1)) + exorabilis "able to be entreated," from exorare "to prevail upon," from ex "out" (see ex-) + orare "pray" (see orator). Related: Inexorably; inexorability.

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