Nemeses

Her lack of self-control when it came to spending was her financial nemeses.

Her addiction to alcohol was one of her nemeses.

The nemeses of clean energy are the fossil fuel industries that have long dominated the world's energy production.

The computer virus was the nemeses of the company's entire network.

The nemeses of computer hackers are the cybersecurity experts who work to keep their networks safe.

Her procrastination was her nemeses when it came to completing projects.