unfounded
adj. 未建立的；没有理由的；没有事实根据的
例句
Her trust in him was unfounded.
她对他的信任毫无道理。
《牛津词典》
The allegations were totally unfounded.
指控是完全无根据的。
《柯林斯英汉双解大词典》
The claims are, I repeat, totally unfounded.
我再说一遍，这些说法是毫无根据的。
