unbeknown

/ˈʌnbəˌnoʊn/
IPA guide

Definitions of unbeknown
  1. adjective
    (usually used with `to') occurring or existing without the knowledge of
    “a crisis unbeknown to me”
    synonyms: unbeknownst
    unknown
    not known
  2. adverb
    without someone's knowledge
    synonyms: unbeknownst
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