Nemeses

Her lack of self-control when it came to spending was her financial nemeses.

The main character's nemeses in the movie were the gang of thieves who had taken over her neighborhood.

The nemeses of clean energy are the fossil fuel industries that have long dominated the world's energy production.

The hiker's nemeses, blisters on her feet, made it difficult for her to continue on the trail.

The hiker's nemeses were the difficult terrain and bad weather.

The hero's nemeses were the villains who sought to destroy the city.