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Adjective: undefeated  ,ún-di'fee-tid
  1. Not having been defeated
    "an undefeated team"; "undefeated in battle";
    - unbeaten

See also: successful, triumphant, unbeaten, unbowed, unconquered, unvanquished, victorious

Antonym: defeated

Encyclopedia: Undefeated, untied, unscored upon, and uninvited