Un·be·known a. Not known; unknown. [Colloq.]
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  unbeknown
       adj : (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" [syn: unbeknown(p),
              unbeknownst(p)]
       adv : without someone's knowledge; "unbeknownst to me, she made
             all the arrangements" [syn: unbeknownst]