nemesis

This term carries a heavy sense of inevitability and fate. While it can describe a persistent rival in sports or business, it implies a relationship where the opponent possesses a specific advantage or psychological hold that makes defeat feel predestined. In a more dramatic or literary sense, it refers to a self-inflicted downfall. Here, the nemesis is not necessarily a person but a flaw or a consequence that catches up to the subject, mirroring the Greek concept of divine retribution for excessive pride.