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Occurring or existing without being known; unknown: a crisis unbeknown to us.

[un- + obsolete beknown, known (from Middle English beknowen, past participle of beknowen, to get to know, from Old English becnāwan : be-, be- + cnāwan, to know; see know).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(ˌʌnbɪˈnəʊn) or


(foll by: to) without the knowledge (of a person): unbeknown to him she had left the country.
rare (usually foll by: to) not known (to)
[C17: from the archaic beknown known; see be-, know]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˌʌn bɪˈnoʊn)

also un•be•knownst


unknown; without one's knowledge (usu. fol. by to).
[1630–40; un-1 + beknown (late Middle English beknowe, past participle of beknowen); see be-, known]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.unbeknown - (usually used with `to') occurring or existing without the knowledge ofunbeknown - (usually used with `to') occurring or existing without the knowledge of; "a crisis unbeknown to me"; "she had been ill for months, unbeknownst to the family"
unknown - not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
Adv.1.unbeknown - without someone's knowledgeunbeknown - without someone's knowledge; "unbeknownst to me, she made all the arrangements"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.


[ˌʌnbɪˈnəʊn] unbeknownst [ˌʌnbɪˈnəʊnst] ADJ unbeknown to mesin yo saberlo
Collins Spanish Dictionary - Complete and Unabridged 8th Edition 2005 © William Collins Sons & Co. Ltd. 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005


[ˌʌnbɪˈnəʊn] unbeknownst [ˌʌnbɪˈnəʊnst] adv
unbeknown to sb, unbeknownst to sb → à l'insu de qn
unbeknown to me → à mon insu
Collins English/French Electronic Resource. © HarperCollins Publishers 2005


advohne dass es jemand wusste; unbeknown to meohne mein Wissen; unbeknown to his fatherohne Wissen seines Vaters
Collins German Dictionary – Complete and Unabridged 7th Edition 2005. © William Collins Sons & Co. Ltd. 1980 © HarperCollins Publishers 1991, 1997, 1999, 2004, 2005, 2007


[ˌʌnbɪˈnəʊn] unbeknownst [ˌʌnbɪˈnəʊnst] adv (old) unbeknown toall'insaputa di
unbeknown to me → a mia insaputa
Collins Italian Dictionary 1st Edition © HarperCollins Publishers 1995
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References in classic literature ?
Had a lion or a leopard sought sanctuary in the interior, unbeknown to the sentries?
'A man of the name of Jerry, sir,' said Short, turning from his selfish colleague to their new acquaintance, 'wot keeps a company of dancing dogs, told me, in a accidental sort of way, that he had seen the old gentleman in connexion with a travelling wax-work, unbeknown to him.
But to drag out a ignoble existence unbeknown to mankind in general--patience!
I have admired you at a distance; and if I have come to town sometimes, with long times between, to take a proud peep at you, I have done it unbeknown, my love, and gone away again.'
'I should like to be the captain of some band, and have the whopping of 'em, and follering 'em about, unbeknown to themselves.
- alive in the same land with them, and that's had such sure information of him when he was alive in another land, as that he couldn't and shouldn't leave it unbeknown and put them in danger.
I know what a friendly heart you've got; but having only known me on my umble footing (on my umblest I should say, for I am very umble still), you might, unbeknown, go against me rather, with my Agnes.
Unbeknown, the monster eediot crawled tull the door an' brayed after hus fashion ot the sun.
Mr Butler said: "Unbeknown to us a fine thread was woven through everyone involved at that time and we are all connected."
''Unbeknown to my children I was staying outside and returning home when they were already in bed.
Unbeknown to them, Gemma and Gorka were in the same location in the Bahamas at the same time years earlier and only realised when sharing travel stories.
Unbeknown to me I had broken my leg and could hardly walk.