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

 

undreamed-of

 adjective
adjective
NAmE//ʌnˈdrimd ʌv//
 
(also undreamt-of
NAmE//ʌnˈdrɛmt ʌv//
 
)
 
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much more or much better than you thought was possible undreamed-of success
See the Oxford Advanced Learner's Dictionary entry: undreamed-of