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unbeknown

[ uhn-bi-nohn ]
/ ˌʌn bɪˈnoʊn /
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adjective
unknown; unperceived; without one's knowledge (usually followed by to).
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QUIZ YOURSELF ON "WAS" VS. "WERE"!
Were you ready for a quiz on this topic? Well, here it is! See how well you can differentiate between the uses of "was" vs. "were" in this quiz.
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“Was” is used for the indicative past tense of “to be,” and “were” is only used for the subjunctive past tense.
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. 2022

How to use unbeknown in a sentence

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
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