Nemeses

His fear of public speaking was his nemeses when it came to advancing his career.

Her fear of public speaking was one of her nemeses in her career advancement.

Time management and work overload were his nemeses at the workplace.

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

Procrastination was one of his nemeses when it came to completing assignments on time.

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

The hero and his nemeses had a fierce battle that lasted for days.