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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).]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.unbeknownst - (usually used with `to') occurring or existing without the knowledge ofunbeknownst - (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 knowledgeunbeknownst - without someone's knowledge; "unbeknownst to me, she made all the arrangements"
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References in classic literature ?
Perhaps they were afraid that their wives had come from Home unbeknownst.
But she must have tipped them off unbeknownst to me, and they knew just what to do.
No mum, but she might have thought (as a habit-like) of its standing in Johnny's light, and might have tried to bring him through it unbeknownst.
Au contraire, if we can manage to stow ourselves away unbeknownst, half the battle will be won.
However, unbeknownst to her, the candle continued to burn and the heat from it eventually transferred from the metal base it was placed in and sparked a fire.
Really, it never careens too far from Goldoni's main plot points: Corden is the conniving yet dim zanni, motivated by his appetites to play errand-boy for Two employers, unbeknownst to both.
Unbeknownst to the school, the council meetings were found to be very similar to what Lawrence Kohlberg had in mind when he developed his Just Community Model.
But when Smith County Justice of the Peace Mitch Shamburger sent the sisters to jail to shake them up a little, ICE stepped in, unbeknownst to him.
Rodis was secretly married and unbeknownst to his parishioners or the diocese, he lived with his wife and three daughters in Fredericksburg, Va.
Unbeknownst to the gunmen, Terry is on the inside - will he risk his life to save the day?
Unbeknownst to me, some parishioners were congregating in the vestibule.