unbeknown to

unbeknown

[uhn-bi-nohn]
adjective
unknown; unperceived; without one's knowledge (usually followed by to ).
Also, unbeknownst [uhn-bi-nohnst] .


Origin:
1630–40; un-1 + beknown (late Middle English beknowe, past participle of beknowen); see be-, known

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unbeknown (ˌʌnbɪˈnəʊn)
 
adv (foll by to)
1.  Also (esp Brit): unbeknownst without the knowledge (of a person): unbeknown to him she had left the country
 
adj (usually foll by to)
2.  rare not known (to)
 
[C17: from the archaic beknown known; see be-, know]

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