undefeated
Britishadjective
Explanation
Has your volleyball team won every single game this season? Then it's undefeated — it hasn't been beaten yet! You'll almost always find this adjective describing sports teams or players who haven't suffered a loss, like the undefeated tennis player who's won all of her matches or the basketball team that's been undefeated for four games. Undefeated adds the prefix un-, or "not," to defeated, "beaten," which we can trace back to the Vulgar Latin diffacere, "destroy."
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
However, Anton Lienert-Brown's late score wrapped up an emphatic win for the three-time world champions, who stretched their undefeated Eden Park sequence to 53 Tests.
From BBC ● Jul. 18, 2026
“But Mother Nature and Father Time remain undefeated, and the ‘deterioration bill’ is now coming due.”
From MarketWatch ● Jul. 7, 2026
The Nasdaq-100 is known for almost always rising in July, but REITs have done even better, as they remain undefeated since 2008.
From The Wall Street Journal ● Jul. 2, 2026
A reminder that governments and governing bodies can get it wrong, but the beautiful game stays undefeated.
From Los Angeles Times ● Jun. 22, 2026
He was already the undefeated school champion, as he had been, he told her, in his former school.
From "Americanah" by Chimamanda Ngozi Adichie
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
