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.

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

The hiker's nemeses, blisters on her feet, made it difficult for her to continue on the trail.

The two rival gangs were nemeses in the crime world.

The hiker's nemeses were the difficult terrain and bad weather.

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