denialist
1 of 2noun
de·ni·al·ist di-ˈnī(-ə)l-ist 
dē-
plural denialists
: 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
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
Lisa Friedman and Brad PlumerThe AIDS denialists use pseudoscience and non-peer-reviewed Internet postings to bolster their false claims … John Moore and Nicoli Nattrass
John Moore and Nicoli Nattrassdenialist
2 of 2adjective
: or, relating to, or characteristic of denialism or denialists
the denialist movement
denialist views/claims
Denialist officials and commentators who throw up their hands and say "I'm not a scientist" are being disingenuous. Eugene Robinson
Eugene Robinson
Word History
Etymology
Noun
denial + -ist entry 1
Adjective
denial + -ist entry 2
First Known Use
Noun
1903, in the meaning defined above
Adjective
1903, in the meaning defined above