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unproven /ˌʌnˈpruːvən/  

Anh-Việt Anh-Anh
  • adjective
    not tested and shown to be true, good, or useful
    scientifically unproven treatments/therapies
    So much in science still remains unproven.
    He's an unproven rookie. [=a rookie who has not yet shown that he can perform well]