Nemeses

His phobia of heights was one of his nemeses that prevented him from enjoying outdoor activities.

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.

His stubbornness was one of his nemeses that often led to arguments with his loved ones.

Her procrastination was her nemeses when it came to completing projects.