Nemeses

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

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

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 thief's greed eventually became his nemeses and led to his capture.

The two rival gangs were nemeses in the crime world.

Their nemeses were their fear of failure and lack of self-confidence.