Definition of “unbeknownst” - English Dictionary

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“unbeknownst” in English

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unbeknownstadverb

uk /ˌʌn.bɪˈnəʊn/ us /ˌʌn.bɪˈnoʊn/ also unbeknown, uk /ˌʌn.bɪˈnəʊn/ us /-ˈnoʊn/ formal

(Definition of “unbeknownst” from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)