Nemeses

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

Her mother was her nemeses when it came to fashion choices.

The scientist believed that time was the ultimate nemeses, always ticking away and limiting his ability to achieve his goals.

The homeowner's nemeses, termites, caused extensive damage to the structure of their house.

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

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