inexorable: [16] Etymologically, inexorable means ‘that cannot be removed by praying’. It is an adjective of many layers, of which the original is Latin ōrāre ‘pray’ (source of English oracle, orator, etc). Addition of the prefix ex- ‘out’ produced exōrāre ‘remove by pleading or entreating’, and further prefixation and suffixation gave inexōrābilis, which entered English partly via French inexorable. => oracle, orator
