The word "baseless" means lacking a strong or valid foundation or evidence. It describes something that is not supported by facts or logical reasoning. Full definition
«We have acted properly at all times in pursuing the allegations in the petition to the Commissioner, and believe that Mr. Paladino is leveling his latest round of baseless allegations in an attempt to distract from his misconduct, and the fact that he has submitted no evidence to the Commissioner that justifies his unlawful disclosure of confidential information,» Board President Barbara Seals Nevergold said. (nystateofpolitics.com)
What made that year of waiting so painful was the way so many innocent DOC employees were dragged through the mud with baseless accusations of a conspiracy which did not exist. (oregonlive.com)
But let's assume for a second that Trump wasn't just making baseless claims about things he knew nothing about. (washingtonpost.com)