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.

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.

The nemeses of clean energy are the fossil fuel industries that have long dominated the world's energy production.

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