1592, in the meaning defined above
Time Traveler for unheard-of
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Cite this Entry
“Unheard-of.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unheard-of. Accessed 8 Aug. 2022.
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More from Merriam-Webster on unheard-of
Nglish: Translation of unheard-of for Spanish Speakers
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