unbeknown

[ uhn-bi-nohn ]
/ ˌʌn bɪˈnoʊn /

adjective

unknown; unperceived; without one's knowledge (usually followed by to).

QUIZZES

HEED THE VOX POPULI, AND TAKE THIS WORD OF THE DAY QUIZ!

Test your memory on these verbal firecrackers from the week of June 29 to July 5!
Question 1 of 7
anchorite
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. 2020

Example sentences from the Web for unbeknownst

British Dictionary definitions for unbeknownst

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