unbeknown

un|be|known /'ʌnbɪn'oʊn/
The form unbeknownst /'ʌnbɪn'oʊnst/is also used.
[PREP-PHRASE]
If something happens unbeknown to you or unbeknownst to you, you do not know about it.
I am appalled that children can mount up debts unbeknown to their parents...
Unbeknownst to her father, she began taking dancing lessons.

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