Nemeses

Her lack of self-control when it came to spending was her financial nemeses.

The farmer's nemeses were the locusts that ate his crops year after year.

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 hero and villain in the action movie were nemeses.

Financial struggles and debt were his nemeses for many years.