American English

Definition of unheard-of adjective from the Oxford Advanced American Dictionary

 

unheard-of

 adjective
adjective
NAmE//ʌnˈhərd ʌv//
 
 
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that has never been known or done; very unusual He had dyed his hair, which was almost unheard-of in the 1960s. It is almost unheard-of for a new band to be offered such a deal.
See the Oxford Advanced Learner's Dictionary entry: unheard-of