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nemesis

/ˈnɛməsɪs/ noun

noun Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about nemesis at Wordnik → Where our words come from →

  1. An enemy, especially an archenemy.
    Batman is in constant conflict with his nemesis, The Joker.
  2. A person or character who specifically brings about the downfall of another person or character, as an agent of that character's fate or destiny, especially within a narrative.
  3. The personification of the "fatal flaw" of a dramatic hero in the style of Greek tragedy.

Origin

From the Greek goddess of retribution Nemesis (Ancient Greek Νέμεσις (Némesis)).

From Wiktionary, via Kaikki.org (CC BY-SA)