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 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.

The detective and his nemeses engaged in a cat-and-mouse game that lasted for years.

The nemeses of the detective were always trying to outsmart him.