adj.無事實根據的；無基礎的；尚未建立的

We hold that their proposal is unfounded. 我們認為他們的建議是無事實根據的。

The claims are, I repeat, totally unfounded. 我再說一遍，這些說法是毫無根據的。

This saying is completely unfounded. 這種說法完全是無稽之談。

I have to say this fear is unfounded. 我必須說，這種擔心純屬杞人憂天。

The rumor that he was arrested was unfounded. 關于他被捕的傳聞是沒有根據的。