unheard-of

UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌʌnˈhɜːrdɒv/US:USA pronunciation: respellingUSA pronunciation: respelling(un hûrduv′, -ov′, -əv)


WordReference Random House Learner's Dictionary of American English © 2025
unˈheard-ˌof,  adj. 
  1. not seen before and not expected;
    unprecedented:an unheard-of scientific advance.
  2. outrageous;
    shocking;
    offensive:his unheard-of extravagance.
  3. not previously known;
    not famous:the debut of an unheard-of singer.

WordReference Random House Unabridged Dictionary of American English © 2025
un•heard-of  (un hûrduv′, -ov′, -əv),USA pronunciation adj. 
  1. that was never heard of;
    unknown:an unheard-of artist.
  2. such as was never known before;
    unprecedented:an unheard-of salary.
  3. shocking or outrageous:unheard-of conduct.
  • 1585–95

Collins Concise English Dictionary © HarperCollins Publishers::
unheard-of
  1. previously unknown: an unheard-of actor
  2. without precedent: an unheard-of treatment
  3. highly offensive: unheard-of behaviour
'unheard-of' also found in these entries (note: many are not synonyms or translations):

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