Also found in: Thesaurus, Idioms.
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).]
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|Adj.||1.||unbeknownst - (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"|
unknown - not known; "an unknown amount"; "an unknown island"; "an unknown writer"; "an unknown source"
|Adv.||1.||unbeknownst - without someone's knowledge; "unbeknownst to me, she made all the arrangements"|