unsubstantiated

1. ADJ A claim, accusation, or story that is unsubstantiated has not been proven to be valid or true. 未經(jīng)證實(shí)的

I do object to their claim, which I find totally unsubstantiated. 我確實(shí)反對他們的說法，我發(fā)現(xiàn)那是完全沒有根據(jù)的。