unbeknown

[ uhn-bi-nohn ]
/ ˌʌn bɪˈnoʊn /
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adjective

unknown; unperceived; without one's knowledge (usually followed by to).
Also un·be·knownst [uhn-bi-nohnst] /ˌʌn bɪˈnoʊnst/.

Origin of unbeknown

1630–40; un-1 + beknown (late Middle English beknowe, past participle of beknowen); see be-, known
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for unbeknown

British Dictionary definitions for unbeknown

unbeknown

/ (ˌʌnbɪˈnəʊn) /

adverb

(sentence modifier foll by to) without the knowledge (of a person)unbeknown to him she had left the country Also (esp Brit): unbeknownst

adjective

(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

unbeknown


adj.

1630s, from un- (1) "not" + beknown (see beknow).

Online Etymology Dictionary, © 2010 Douglas Harper