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skeptic

adjective

skeptical: used esp. in philosophy

noun

  1. a member of any of the ancient Greek philosophical schools that denied the possibility of any certain knowledge
  2. a person who believes in or practices philosophical skepticism
  3. a person who habitually doubts, questions, or suspends judgment upon matters generally accepted
  4. a person who doubts religious doctrines

See skeptic in American Heritage Dictionary 4

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