
Nemesis
Unbeatable Challenge
Use 'nemesis' for something or someone that always seems to defeat or outdo a person, often creating ongoing strife.

Trying to swim across the channel proved to be his nemesis.
Personal Opposition
'Nemesis' often signifies a particular person's long-standing rival, implying deep-seated competition.

At every chess tournament, he saw her as his nemesis.
Pop Culture Reference
In stories, 'nemesis' is commonly used to describe the main antagonist or villain who opposes the hero.

The superhero confronted his nemesis in an epic battle for justice.
Compare with
AdversaryAntagonistCompetitorEnemyFoeRival
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