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1.
One who excessively denies the truth.
Hey you cold hearted denialist, why don't you believe the truth.
by Kenneth H. January 28, 2006
 
2.
Some poor bitch who can't handle the truth and lives their life by believing lies and convincing themselves of things that nobody believes but them.
Person one: dude I'm totally gonna bang that chick.
Person two: I don't think so, I think its more likely you become a denialist.
by UDEMON November 13, 2010