unknown; unperceived; without one's knowledge (usually followed by to).
Also un·be·knownst [uhn-bi-nohnst] /ˌʌn bɪˈnoʊnst/
Origin of unbeknown
(late Middle English beknowe,
past participle of beknowen
); see be-
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for unbeknown
Historical Examples of unbeknown
Where he come from and where he's gone to is unbeknown to me.
I told Grant if he could let Jeff Davis escape all unbeknown to himself, to let him go.
All unbeknown to himself, she had made him stand for his King.
That, or a three-pronged fork, said Cole, unbeknown to any but herself.
That wonderful man, as is always prowling about, unbeknown to any one.
British Dictionary definitions for unbeknown
(sentence modifier foll by to) without the knowledge (of a person)unbeknown to him she had left the country Also (esp Brit): unbeknownst
(postpositive usually foll by to) rare not known (to)
Word Origin for unbeknown
C17: from the archaic beknown known; see be-, know
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Word Origin and History for unbeknown
1630s, from un- (1) "not" + beknown (see beknow).
Online Etymology Dictionary, © 2010 Douglas Harper