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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).]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
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Perhaps they were afraid that their wives had come from Home unbeknownst. The fourth said that he had acted on the impulse of the moment.
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.
Unbeknownst to him, Jacob decides to reach out to Maya by trying to apply for a prison visiting order.
However, unbeknownst to the cosmetics company, the Chinese suppliers obtained the materials from North Korea.
He told the clerk that he did not have the funds to pay for the glasses and hoped to return another time when he had the money, but unbeknownst to him, he wouldn't have to.
Unbeknownst to Sabrina, when she was just a year old, she was taken from her mother, Diana, by her aunts with the approval of her father, Edward.
Unbeknownst to most scholars, certain powerful, well-guarded, tacit assumptions and practices govern the production of knowledge in practical theology, says Goto, and sustain privilege and oppression in the scholarly discipline.
Though unbeknownst to him, he is being manipulated by their "best mate" Teddy (Robson Green).
But let's start with, 'what is shadow banning?' The best definition we found is this: deliberately making someone's content undiscoverable to everyone except the person who posted it, unbeknownst to the original poster.
Lachlan starts to panic Aaron confides in Liv that he's secretly plotting to propose to Robert, who - unbeknownst to him - is doing the exact same thing.