un·heard-of
| \ ˌən-ˈhərd-ˌəv
, -ˌäv \
, -ˌäv \
Definition of unheard-of
: previously unknown
especially
: unprecedented
moving at unheard-of speeds
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“Unheard-of.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/unheard-of. Accessed 8 Aug. 2022.
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Time Traveler for unheard-of
The first known use of unheard-of was in 1592
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