"Baseless assumptions" means making conclusions or beliefs without any valid evidence or reasoning to support them. It refers to ideas or judgments that are not grounded in facts or logical thinking. Full definition
Yea, because lets make vast, baseless assumptions about all the people pointing out the obvious flaws in the kids «convictions!» (religion.blogs.cnn.com)
So, like I said, you couldn't do it without a ton of baseless assumptions and ad hoc reasoning. (religion.blogs.cnn.com)
Some of you here are so quick to judge on baseless assumptions, its unbelieveable! (justarsenal.com)