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unknown

adjective
 
 
/ʌnˈnəʊn/ US  /-ˈnoʊn/

Definition

B1 not known or familiar: The exact number of people carrying the virus is unknown. As recently as six months ago her name was almost unknown in Britain. Unknown to me, she'd organized a party for my birthday.Unknown and unfamiliar
(Definition of unknown adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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