unbeknownst adjective - Definition, pictures, pronunciation and usage notes | Oxford Advanced American Dictionary at OxfordLearnersDictionaries.com

Definition of unbeknownst adjective from the Oxford Advanced American Dictionary

unbeknownst

adjective

NAmE//ˌʌnbɪˈnoʊnst//

(also unbeknown

NAmE//ˌʌnbɪˈnoʊn//

) unbeknownst to somebody (formal)

without the person mentioned knowing Unbeknown to her they had organized a surprise party.

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