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unheard-of

1 ENTRIES FOUND:
unheard-of /ˌʌnˈhɚdˌʌv/ adjective
unheard-of
/ˌʌnˈhɚdˌʌv/
adjective
Learner's definition of UNHEARD-OF
: not known to have existed or happened before : very unusual从未听说过的;前所未闻的;空前的

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

Word History

First Known Use

1592, in the meaning defined above

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

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