an unsubstantiated claim/rumour, etc.
未经证实的说法、传言等
牛津词典
I do object to their claim, which I find totally unsubstantiated.
我强烈反对他们的说法，那是毫无根据的。
...unsubstantiated rumours about his private life.
有关他私生活的捕风捉影的谣言
Indiscriminant use of antibiotics for unsubstantiated infections should not be encouraged.
试验性的抗生素应用在没有客观证据的感染中是不被支持的.
期刊摘选
Many newspapers quoted figures that are unsubstantiated.
许多报纸采用了不确切的数字.
期刊摘选
Many contemporary publications quote figures that are unsubstantiated.
许多现行刊物所采用的数字是不确切的.
辞典例句
He claimed the charges against him were unsubstantiated.
他声称对他的指控是完全没有事实依据的.
期刊摘选
His attack of the president was unsubstantiated.
说他袭击总统是没有事实根据的.
期刊摘选
I do object to their claim, which I find totally unsubstantiated.
我强烈反对他们的说法，那是毫无根据的。
辞典例句
There are reports that some military aircraft flew in formation when they were low on fuel during the Second World War, but Dr. lissaman says they are unsubstantiated.
2010年考研真题（英语二）阅读理解 Section Ⅱ