1
[ adverb ] without someone's knowledge

Synonyms

unbeknown

Examples

"unbeknownst to me, she made all the arrangements"

2
[ adjective ] (usually used with `to') occurring or existing without the knowledge of

Synonyms

unbeknown

Examples

"a crisis unbeknown to me" "she had been ill for months, unbeknownst to the family"

Related terms

unknown

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