unbeknown
adjective/ˌʌnbɪˈnəʊn/
/ˌʌnbɪˈnəʊn/
(also less frequent unbeknownst
(formal)/ˌʌnbɪˈnəʊnst/
/ˌʌnbɪˈnəʊnst/
)- unbeknown to somebody without the person mentioned knowing
- Unbeknown to her they had organized a surprise party.
Word Originmid 17th cent.: from un- ‘not’ + archaic beknown ‘known’.Definitions on the go
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unbeknown