"Baseless speculation" refers to making assumptions or guesses without any evidence or logical reasoning to support them. It means someone is speculating or suggesting something without any valid grounds or solid facts to back it up. Full definition
Your post will be deleted if it does not contain any analysis as baseless speculation helps no one. (reddit.com)
Sounds like baseless speculation to me... (movie-wave.net)
I love how most of nathans articles are sensationist for the titles and then when you read the articles they are just baseless speculation. (blog.the-ebook-reader.com)