nemesis

باللغة العربية: عَدُوّ لَدُود، غَرِيم

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.
4. Polar opposite, especially of a literary character.
5. The principle of retributive justice.
6. A punishment or defeat that is deserved and cannot be avoided; (an instance of) retribution. (formal)

الجمع nemeses