DICT.TW Dictionary Taiwan

 un·be·knownst /ˌʌnbɪˈnon(t)st/

 unbeknownst
      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: unbeknown]