Nemeses

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

His phobia of heights was one of his nemeses that prevented him from enjoying outdoor activities.

The traveler's nemeses, lost luggage and delayed flights, ruined her vacation.

The detective and his nemeses engaged in a cat-and-mouse game that lasted for years.

The nemeses of the detective were always trying to outsmart him.

Writer's block and self-doubt were his nemeses when it came to writing.