Unbeknownst Definition
 ŭnbĭ-nōnst 
    adjective
  
 Unbeknown.
 American Heritage 
Unknown or unperceived; without one's knowledge.
 Webster's New World 
Synonyms: 
  
    adverb
  
 Without the knowledge of a specified party. Used with to .
 Our cousin had been ill for years, unbeknownst to the family.
 American Heritage 
Synonyms: 
  Origin of Unbeknownst
-  C. 1636: unusual form of un- +"Ž beknown From Wiktionary 
- unbeknown -st (as in amongst) - From American Heritage Dictionary of the English Language, 5th Edition 
- WOTD - 23 June 2012 - From Wiktionary 
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