nemesis

The definition of a nemesis is an enemy who can't be beaten.

(noun)

An example of a nemesis is Lex Luther to Superman.

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See nemesis in Webster's New World College Dictionary

noun pl. nemeses

  1. Gr. Myth. the goddess of retributive justice, or vengeance
    1. just punishment; retribution
    2. one who imposes retribution
  2. anyone or anything which seems to be the inevitable cause of someone's downfall or defeat

Origin: L < Gr nemein, to distribute, deal out: see -nomy

See nemesis in American Heritage Dictionary 4

noun pl. nem·e·ses (-sēzˌ)
  1. A source of harm or ruin: Uncritical trust is my nemesis.
  2. Retributive justice in its execution or outcome: To follow the proposed course of action is to invite nemesis.
  3. An opponent that cannot be beaten or overcome.
  4. One that inflicts retribution or vengeance.
  5. Nemesis Greek Mythology The goddess of retributive justice or vengeance.

Origin:

Origin: Greek, retribution, the goddess Nemesis

Origin: , from nemein, to allot; see nem- in Indo-European roots

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