unheard-of

adjective

un·​heard-of ˌən-ˈhərd-ˌəv How to pronounce unheard-of (audio)
-ˌäv
: previously unknown
especially : unprecedented
moving at unheard-of speeds

Examples of unheard-of in a Sentence

houses selling at unheard-of prices
Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Austin points the way for New York, where supply is so tight, rental vacancy rates are an unheard-of 1.4%: produce more places for people to live — all types, for people at all income levels — and rents will slow their growth or even start to come down. New York Daily News Editorial Board, New York Daily News, 2 Mar. 2025 But unilateral missile disarmament is virtually unheard-of in international relations. Hussein Ibish, The Atlantic, 27 Feb. 2025 Eight different players found the back of the net for the Americans in the matchup, with Chase Adams leading the way by scoring an unheard-of 10 goals in the outing. Josh Hammer, Newsweek, 15 Feb. 2025 Not to mention, the stock is currently on an almost unheard-of 15-day winning streak. Jeff Kilburg, CNBC, 7 Feb. 2025 See All Example Sentences for unheard-of

Word History

First Known Use

1592, in the meaning defined above

Time Traveler
The first known use of unheard-of was in 1592

Browse Nearby Words

Cite this Entry

“Unheard-of.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unheard-of. Accessed 13 Mar. 2025.

Kids Definition

unheard-of

adjective
un·​heard-of
-ˌəv,
-ˌäv
: previously unknown : unprecedented
moving at unheard-of speeds

More from Merriam-Webster on unheard-of

Last Updated: - Updated example sentences
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