un ‧ sub ‧ stan ‧ ti ‧ at ‧ ed /ˌʌnsəbˈstænʃieɪtəd, ˌʌnsəbˈstænʃieɪtɪd/ BrE AmE adjective
not proved to be true:
unsubstantiated allegations of child abuse
un ‧ sub ‧ stan ‧ ti ‧ at ‧ ed /ˌʌnsəbˈstænʃieɪtəd, ˌʌnsəbˈstænʃieɪtɪd/ BrE AmE adjective
not proved to be true:
unsubstantiated allegations of child abuse
Longman Dictionary of Contemporary English. Longman - Словарь современного английского языка. 2012