Nemeses

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

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.

The rainy weather has been a nemeses to the outdoor wedding plans.

Financial struggles and debt were his nemeses for many years.