Nemeses

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

His fear of public speaking was his nemeses when it came to advancing his career.

Her fear of public speaking was one of her nemeses in her career advancement.

Time management and work overload were his nemeses at the workplace.

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.

Financial struggles and debt were his nemeses for many years.