nemesis
Synonym discussion
Sense: noun/1
For sense 1, nemesis suggests a person or thing that keeps beating you or ruining your plans, often with a feeling that you can never quite get past it. Archenemy is stronger and more dramatic, and it is almost always a human enemy in stories or public conflicts. Rival is much broader and more neutral: two people can be rivals without one becoming the other's downfall. Bane is usually a thing, not a person, and it stresses repeated misery more than active opposition. A difficult maths exam can be your nemesis, a film villain can be an archenemy, a classmate can be a rival, and traffic noise can be your bane.
Common collocations
Etymology
Nemesis comes from the name of Nemesis, the Greek goddess linked with giving people what they deserve. In English, the word first pointed to righteous punishment or revenge, and later widened to mean the force, person, or situation that brings someone down.