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English definition of “undreamed of”

undreamed of

adjective [not gradable]    /ʌnˈdrimdˌʌv/ (also undreamt of,  /ʌnˈdremˌtəv/)
better or greater than anyone would think possible: Through the Internet, we have access to information that was undreamed of 30 years ago.
(Definition of undreamed of adjective from the Cambridge Academic Content Dictionary © Cambridge University Press)
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