Nemeses

The farmer's nemeses were the locusts that ate his crops year after year.

Her mother was her nemeses when it came to fashion choices.

The scientist believed that time was the ultimate nemeses, always ticking away and limiting his ability to achieve his goals.

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.