Definition of unknown adjective from the Oxford Advanced Learner's Dictionary

      

    unknown

     adjective
    adjective
    BrE BrE//ˌʌnˈnəʊn//
     
    ; NAmE NAmE//ˌʌnˈnoʊn//
     
     
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  1. 1  unknown (to somebody) not known or identified a species of insect previously unknown to science He was trying, for some unknown reason, to count the stars. The man's identity remains unknown.
  2. 2  (of people) not famous or well known an unknown actor The author is virtually unknown outside Poland.
  3. 3  never happening or existing The disease is as yet unknown in Europe (= there have been no cases there). It was not unknown for people to have to wait several hours (= it happened sometimes).
  4. Extra examples He cites the works of two otherwise unknown authors, the originals of these works having been lost. His whereabouts were quite unknown during this period. She departed for parts unknown. She was then still comparatively unknown. These sites remain largely unknown to the British public. This drug was practically unknown in Britain. a comparatively unknown actor a period of democratic development previously unknown in their country He was trying, for some unknown reason, to count the stars. The man’s identity remains unknown.Idioms a person or thing whose qualities or abilities are not yet known without the person mentioned being aware of it Unknown to me, he had already signed the agreement.
See the Oxford Advanced American Dictionary entry: unknown