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Synonyms & Antonyms of unheard-of
not known or experienced before
- houses selling at unheard-of prices
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“Unheard-of.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/unheard-of. Accessed 21 Oct. 2021.
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The first known use of unheard-of was in 1592
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