dogmatist

/ˈdɔɡmətɪst/
noun
  1. A person who asserts their opinions in a dogmatic manner, as if they are unquestionably true.
    • A true scientist avoids being a dogmatist and remains open to new evidence.
    • He was such a dogmatist that he refused to even consider alternative solutions.
    • The debate became frustrating because the dogmatist kept repeating the same points.
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