Nemeses

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

The roadrunner and coyote were nemeses in the cartoon.

Impulsive buying was one of her nemeses that resulted in a financial crisis.

The nemeses of clean energy are the fossil fuel industries that have long dominated the world's energy production.

The cat and mouse were nemeses in the classic cartoon.

The thief's greed eventually became his nemeses and led to his capture.

The two rival gangs were nemeses in the crime world.