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undefeated

adjective B2
  1. Never defeated; always victorious. · Near-synonyms: unvanquished, unbeaten, unconquered· He was the undefeated tiddlywinks champion of the school.
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For the next seventeen years, this magnificent schooner remained completely undefeated.
The Legend of the Bluenose, p. 1 · B2

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.