Unheard-of - definition, pronunciation, transcription

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Amer.  |ʌnˈhɜrdˌʌv|  American pronunciation of the word unheard-of
Brit.  |ʌnˈhɜːdɒv|  British pronunciation of the word unheard-of

adjective

- previously unknown
developments on an unheard-of scale

Extra examples

Travel for pleasure was almost unheard of until the 19th century.

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