专家为各位考生整理了雅思词汇：unsubstantiated供考生们参考使用。
unsubstantiated
adj.未经证实的，没有事实根据的
例题：
There are numerous unsubstantiated reports that natural vitamins are superior to synthetic ones, that fertilized eggs are nutritionally superior to unfertilized eggs, that untreated grains are better than fumigated grains, and the like.
The word “unsubstantiated” is closest in meaning to which of following?
(A) unbelievable
(B) uncontested
(C) unpopular
(D) unverified
答案：D
