Nemeses

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

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

Her addiction to alcohol was one of her nemeses.

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.

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