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 musician's nemeses, stage fright and technical difficulties, affected her performance.

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

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

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