Definitions for unbeknownst
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Princeton's WordNet
unbeknown(p), unbeknownst(p)(adverb)
(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"
unbeknown, unbeknownst(adverb)
without someone's knowledge
"unbeknownst to me, she made all the arrangements"
Wiktionary
unbeknownst(Adverb)
(followed by to) Without the knowledge of.
He went home early, unbeknownst to his mother.
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"unbeknownst." Definitions.net. STANDS4 LLC, 2013. Web. 18 Jun 2013. <http://www.definitions.net/definition/unbeknownst>.