Nemeses

The roadrunner and coyote were nemeses in the cartoon.

The cat and mouse were nemeses in the classic cartoon.

Growing up in poverty, she believed that a life of struggle was her nemeses.

He had a feeling of foreboding that the car accident he had avoided would ultimately prove to be his nemeses.

The hero and his nemeses had a fierce battle that lasted for days.

Their nemeses were their fear of failure and lack of self-confidence.