American English

Definition of unsubstantiated adjective from the Oxford Advanced American Dictionary

     

    unsubstantiated

     adjective
    adjective
    NAmE//ˌʌnsəbˈstænʃiˌeɪt̮əd//
     
    (formal)
     
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  1. 1not proved to be true by evidence synonym unsupported
  2. 2 an unsubstantiated claim/rumor, etc.
See the Oxford Advanced Learner's Dictionary entry: unsubstantiated