denialist

noun
  1. a person who denies or refuses to accept a widely established fact or scientific consensus
  2. Usage: often used in contexts such as climate change denial, historical denial, or denial of established medical facts
adjective
  1. relating to or characteristic of denial of established facts or scientific consensus
  2. Usage: descriptive use; often appears in phrases like 'denialist rhetoric' or 'denialist movement'

Examples