Nemeses

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

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.

Poor time management was one of his nemeses that hindered his productivity.

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