unbeknownst

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unbeknownst /ˌʌnbɪˈnoʊnst/ adjective
or unbeknown /ˌʌnbɪˈnoʊn/
unbeknownst
/ˌʌnbɪˈnoʊnst/
adjective
or unbeknown /ˌʌnbɪˈnoʊn/
Learner's definition of UNBEKNOWNST

unbeknownst/unbeknown to

: without being known about by (someone)
◊ In U.S. English unbeknownst is more common than unbeknown. In British English, unbeknown is more common.
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