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English definition of “unheard-of”

unheard-of

adjective    /ʌnˈhɜrdˌʌv, -ˌɑv, -əv/
surprising or shocking because not known about or previously experienced: Price wars have sliced prices to unheard-of lows.
(Definition of unheard-of adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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