Nemeses

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

The rising sea levels and extreme weather conditions are the nemeses of climate change activists.

The thief's greed eventually became his nemeses and led to his capture.

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

The hero and villain in the action movie were nemeses.

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

The two rival gangs were nemeses in the crime world.

Writer's block and self-doubt were his nemeses when it came to writing.