Usually means: Previously unknown or extremely unusual.
Definitions Related words Mentions
We found 21 dictionaries that define the word unheard-of:

General (21 matching dictionaries)
  1. unheard-of: Merriam-Webster
  2. unheard-of: American Heritage Dictionary of the English Language
  3. unheard-of, unheard-of: Collins English Dictionary
  4. unheard-of: Vocabulary.com
  5. Unheard-of, unheard-of: Wordnik
  6. unheard-of: Cambridge Advanced Learner's Dictionary
  7. unheard-of: Wiktionary
  8. unheard-of: Webster's New World College Dictionary, 4th Ed.
  9. unheard-of: The Wordsmyth English Dictionary-Thesaurus
  10. unheard-of: Infoplease Dictionary
  11. unheard-of: Dictionary.com
  12. unheard-of: Cambridge Essential American English Dictionary
  13. Unheard-of: Online Plain Text English Dictionary
  14. unheard-of: Webster's Revised Unabridged, 1913 Edition
  15. unheard-of: Rhymezone
  16. Unheard-of: AllWords.com Multi-Lingual Dictionary
  17. unheard-of: FreeDictionary.org
  18. unheard-of: Mnemonic Dictionary
  19. unheard-of: TheFreeDictionary.com

Definitions from Wiktionary (
)
American English Definition British English Definition
adjective:  Previously unknown; unprecedented.

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