TWOTD..."inexorable"

[Cheesypuff]

inexorable \in-EK-sur-uh-bul; in-EKS-ruh-bul\, adjective:
Not to be persuaded or moved by entreaty or prayer; firm; determined; unyielding; unchangeable; inflexible; relentless.

[Markel]

I know a girl that had an inexorable eating disorder - she got really thin.