English

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

 

unsubstantiated

 adjective
adjective
BrE BrE//ˌʌnsəbˈstænʃieɪtɪd//
 
; NAmE NAmE//ˌʌnsəbˈstænʃieɪtɪd//
 
(formal)
 
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not proved to be true by evidence synonym unsupported an unsubstantiated claim/rumour, etc. The court found that most of her claims were unsubstantiated. There were unsubstantiated rumours of abuse at the prison.
See the Oxford Advanced American Dictionary entry: unsubstantiated