Usually means: Unknown by someone; not aware.
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We found 15 dictionaries that define the word unbeknownst:

General (14 matching dictionaries)
  1. unbeknownst: Merriam-Webster
  2. unbeknownst: Oxford Learner's Dictionaries
  3. unbeknownst: American Heritage Dictionary of the English Language
  4. unbeknownst: Collins English Dictionary
  5. unbeknownst: Vocabulary.com
  6. Unbeknownst, unbeknownst: Wordnik
  7. unbeknownst: Cambridge Advanced Learner's Dictionary
  8. unbeknownst: Wiktionary
  9. unbeknownst: Dictionary.com
  10. unbeknownst: Online Etymology Dictionary
  11. unbeknownst: Rhymezone
  12. unbeknownst: FreeDictionary.org
  13. unbeknownst: Mnemonic Dictionary
  14. unbeknownst: TheFreeDictionary.com

Slang (1 matching dictionary)
  1. Unbeknownst: Dublin Slang and Phrasebook

Definitions from Wiktionary (unbeknownst)

adverb:  (followed by to) without the knowledge of

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    midnight blue,     shadow gray,     veiled violet, more...
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Types:

Phrases:

Adjectives:

Colors:
    midnight blue,     shadow gray,     veiled violet, more...



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