of, undreamt of - (esp. of wealth, success or advancement) better or greater than anyone would think possibleThese two lads from a remote village in Norway have enjoyed undreamed of success with their first album.We in the west enjoy a standard of living undreamed of by the majority of people in the world.
UNDREAMED
Meaning of UNDREAMED in English
Cambridge English vocab. Кембриджский английский словарь. 2012