: a person who denies the existence, truth, or validity of something despite proof or strong evidence that it is real, true, or valid : someone who practices denialism
For those of us who prefer to remain based in reality, the denialists represent a conundrum. Plenty of them are intelligent and educated—yet they just will not accept scientific findings as true. Dan Hurley
"Scientists tell them inconvenient things," said Jerry Taylor, president of the Niskanen Center, a centrist research organization, and former climate change denialist who now advocates for the acceptance of climate science. Lisa Friedman and Brad Plumer
The AIDS denialists use pseudoscience and non-peer-reviewed Internet postings to bolster their false claims … John Moore and Nicoli Nattrass