unbeknown

Adverb
  1. Without someone's knowledge (synset 400486260)
    "unbeknownst to me, she made all the arrangements"
    same as: unbeknownst
Adjective
  1. (usually used with `to') occurring or existing without the knowledge of (synset 301380414)
    "a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family"
    similar to: unknown - not known
    same as: unbeknownst

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