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If I have a non-person object or idea that I consider to be my nemesis¹, how could I refer to the object as a noun but use an embellishing adjective to emphasize that the object is my nemesis?

For instance, "Since the end of World War II, Communism has been the [nemesisical] ideology of the United States."

Some words that come to mind include adversarial, opposing, antagonistic, but these don't have quite the same meaning.

¹This question was prompted by a non-deleted question on Programmers.SE: Do you have a [programming] language that's your nemesis? (10k only)

If I have a non-person object or idea that I consider to be my nemesis¹, how could I refer to the object as a noun but use an embellishing adjective to emphasize that the object is my nemesis?

For instance, "Since the end of World War II, Communism has been the [nemesisical] ideology of the United States."

Some words that come to mind include adversarial, opposing, antagonistic, but these don't have quite the same meaning.

¹This question was prompted by a now-deleted question on Software Engineering.SE: Do you have a [programming] language that's your nemesis? (10k only)