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unbeknownst

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un⋅be⋅known

[uhn-bi-nohn]
–adjective
unknown; unperceived; without one's knowledge (usually fol. by to).
Also, un⋅be⋅knownst [uhn-bi-nohnst] .


Origin:
1630–40; un- 1 + beknown (late ME beknowe, ptp. of beknowen); see be-, known
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To unbeknownst
un·be·knownst   (ŭn'bĭ-nōnst')   
adj.  Unbeknown.
adv.  Without the knowledge of a specified party. Used with to: Our cousin had been ill for years, unbeknownst to the family.

[unbeknown + -st (as in amongst).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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