Nemeses

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

His short temper was one of his nemeses in his personal and professional relationships.

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.

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

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