inexorable (adj.) Look up inexorable at Dictionary.com
1550s, from Middle French inexorable and directly from Latin inexorabilis "that cannot be moved by entreaty," 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.