What is 毫無根據 in English

unfounded
(http://hk.dictionary.yahoo.com/search.html?q=1&s=unfounded)

groundless
(http://hk.dictionary.yahoo.com/search.html?q=1&s=groundless)

with no basis in fact

without foundation or good reason

What is 毫無根據 in English

It has no reference at all.
or
No supporting datas

圖片參考：http://hk.yimg.com/i/icon/16/1.gif
Without basis/ without basis

You can simply use - 'there is no basis'