[uhn-hurd-uhv, -ov, -uh v]
See more synonyms for unheard-of on Thesaurus.com
  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.

Origin of unheard-of

First recorded in 1585–95
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for unheard-of

Contemporary Examples of unheard-of

Historical Examples of unheard-of

  • She was perfectly aware that she had done an unheard-of thing.

  • He spoke as if three thousand dollars was an unheard-of sum, a fortune.

    Cap'n Dan's Daughter

    Joseph C. Lincoln

  • The priests are credited with unheard-of influence among the poor.

    Ireland as It Is

    Robert John Buckley (AKA R.J.B.)

  • Dear me, what unheard-of sacrifices does it demand of humble fortunes to be Respectable!

    One Of Them

    Charles James Lever

  • Whence, then, these strange words, these unheard-of opinions?

    The Wild Geese

    Stanley John Weyman

British Dictionary definitions for unheard-of


  1. previously unknownan unheard-of actress
  2. without precedentan unheard-of treatment
  3. highly offensiveunheard-of behaviour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012