Nemeses

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

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

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

The homeowner's nemeses, termites, caused extensive damage to the structure of their house.

The traveler's nemeses, lost luggage and delayed flights, ruined her vacation.