'inexorable' originates from Latin, specifically the word 'inexorabilis,' where 'in-' meant 'not' and 'exorabilis' meant 'able to be entreated.'

'inexorabilis' transformed into the French word 'inexorable,' and eventually became the modern English word 'inexorable' through Middle English.

Initially, it meant 'not able to be persuaded,' but over time it evolved into its current meaning of 'impossible to stop or prevent.'