Nemeses

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

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

The computer virus was the nemeses of the company's entire network.

The nemeses of computer hackers are the cybersecurity experts who work to keep their networks safe.

His impulsive behavior became his nemeses in the courtroom.

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