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]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But unbeknown to them a more familiar one was in the making.
Agencies may also consider regular updates of inquiries, as someone's status may have changed unbeknown to the agency.
The problem is, unbeknown to them, these extensions are exposing them to risk.
Unbeknown to him, repeated use of cocaine has brought about dramatic changes in both the structure and function of his brain.
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