Nemeses

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

The farmer's nemeses were the locusts that ate his crops year after year.

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.

Her nemeses were her anxiety and perfectionism.

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