s without a basis in reason or fact
a. 没有事实根据的, 没有理由的, 虚幻的, 未建立的
[法] 无根据的, 无稽的, 没有理的
1. His fears about the new policy are unfounded.
他对新政策的担忧是没有根据的。
2. The rumors about her leaving the company were unfounded.
关于她离开公司的传闻是毫无根据的。
3. They proved that the accusations against him were unfounded.
他们证明了对他的指控是没有根据的。