A person who opposes dogmatism and advocates for questioning established beliefs and remaining open to new ideas.
From antidogmatism + -ist (a person who practices). The -ist suffix identifies someone as a follower or practitioner of a philosophy.
Famous antidogmatists include the ancient skeptics like Pyrrho and modern scientists like Richard Feynman—people who made careers out of saying 'wait, are you SURE about that?'
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