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unbeknown Meaning, Definition & Usage

  1. adjective satellite (usually used with `to') occurring or existing without the knowledge of
    unbeknownst.
    • a crisis unbeknown to me
    • she had been ill for months, unbeknownst to the family
  2. adverb without someone's knowledge
    unbeknownst.
    • unbeknownst to me, she made all the arrangements
WordNet

Un`be*known" adjective
Definitions
  1. Not known; unknown. Colloq.

Webster 1913