IPA: /ɪˈnɛksərəbləs/
KK: /ɪˈnɛksərəbəl/
The quality of being impossible to stop or prevent; relentless or unyielding nature.
The inexorableness of time makes it impossible to hold onto the past.
Inexorableness → It is formed from "in-" (meaning not), "exorabilis" (from Latin, meaning to be moved by entreaty), and "-ness" (meaning the state or quality of). The word describes the quality of being unable to be persuaded or moved, hence relentless or unyielding.
Think of 'not' ('in-') being able to be 'moved by entreaty' ('exorabilis') — that's why inexorableness means the quality of being unyielding.