Meaning of “unheard-of” in the English Dictionary

american-english dictionary

"unheard-of" in British English

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(Definition of “unheard-of” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unheard-of" in American English

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us /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” from the Cambridge Academic Content Dictionary © Cambridge University Press)