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English definition of “unheard-of”

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unheard-of

adjective  /ʌnˈhɜrdˌʌv, -ˌɑv, -əv/ us  
surprising or shocking because not known about or previously experienced: Price wars have sliced prices to unheard-of lows.
Translations of “unheard-of”
in Chinese (Traditional) 令人震驚的, 前所未聞的,空前的…
in Chinese (Simplified) 令人震惊的, 前所未闻的,空前的…
(Definition of unheard-of from the Cambridge Academic Content Dictionary © Cambridge University Press)
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