Definition of unbeknown in English:

unbeknown

Line breaks: un|be¦known
Pronunciation: /ʌnbɪˈnəʊn
 
/
(also unbeknownst /-ˈnəʊnst/)

adjective

(unbeknown to)
Without the knowledge of (someone): unbeknown to me, she made some enquiries
More example sentences
  • He further relies upon the fact that, unbeknown to him, his informant status had become public knowledge.
  • The informer said that, unbeknown to retailers, it could be as long as 20 days from slaughter to final use-by date for a raw chicken breast.
  • There was a reason for this: unbeknown to the Reserve Bank, the major banks were working secretly and cooperatively to develop an alternative payment system that would substitute for direct debits.

Origin

mid 17th century: from un-1 'not' + archaic beknown 'known'.

Definition of unbeknown in: