The theory seems to have no basis in fact.

这一理论似乎没有事实根据。

《牛津词典》

This theory seems to have no basis in fact.

这一理论似乎没有实际的根据。

youdao

This is a common fallacy which has no basis in fact.

这是一个没有事实依据的常见谬误。

youdao

But experts say it's a common misconception that has no basis in fact.

CNN: Regional accents thrive in U.S. -- but is that a good thing?

The appeal also said there was "no basis in fact or in law" justifying terms under which Pistorius must be supervised by a probation officer and a correctional official.

NPR: Pistorius Lawyers Appeal Bail Conditions

"First of all, any speculation at this point about the 2006 budget really has no basis in fact, because no decisions have been made, and they won't be made for months, " McClellan said.

CNN: White House budget memo riles Democrats