Definition of undreamed-of adjective from the Oxford Advanced Learner's Dictionary

 

undreamed-of

 adjective
adjective
BrE BrE//ʌnˈdriːmd ɒv//
 
; NAmE NAmE//ʌv//
 
(also undreamt-of
BrE BrE//ʌnˈdremt ɒv//
 
; NAmE NAmE//ʌv//
 
especially in British English
)
 
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much more or much better than you thought was possible undreamed-of success
See the Oxford Advanced American Dictionary entry: undreamed-of