Nemeses

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

Her mother was her nemeses when it came to fashion choices.

Impulsive buying was one of her nemeses that resulted in a financial crisis.

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

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.