"Unfounded claims" refers to statements or allegations that have no basis in truth or evidence. It means that the claims are made without any solid or reliable support. Full definition
They protect police against unfounded claims of brutality and misconduct while documenting those rare — but real — moments when officers cross the line. (slaw.ca)
While the media will continue to report unfounded claims about climate change, the facts don't lie. (dailycaller.com)