unbeknownst
adjective
1 unbeknownst
usually used with `to' Occurring or existing without the knowledge of:
— She had been ill for months, unbeknownst to the family.
synonym: unbeknown.
adverb
1 unbeknownst
Without someone's knowledge:
— Unbeknownst to me, she made all the arrangements.
synonym: unbeknown.
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