Nemeses

The detective knew that the elusive criminal was his nemeses, always managing to evade capture.

The city's nemeses, potholes, made for a bumpy and frustrating commute.

Poor time management was one of his nemeses that hindered his productivity.

His impulsive behavior became his nemeses in the courtroom.

The nemeses of the criminal underworld are the police officers who tirelessly work to bring them to justice.