Etymology
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unbeknown (adj.)

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

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Definitions of unbeknown
1
unbeknown (adv.)
without someone's knowledge;
Synonyms: unbeknownst
2
unbeknown (adj.)
(usually used with `to') occurring or existing without the knowledge of;
a crisis unbeknown to me
Synonyms: unbeknownst
From wordnet.princeton.edu