undoctrinaire

/ʌnˌdɑktrəˈnɛr/
adjective
  1. Not bound by or following a strict set of beliefs or principles; flexible and open-minded.
    • The politician was undoctrinaire, willing to work with both parties.
    • An undoctrinaire scientist questions old theories and welcomes new evidence.
    • Her undoctrinaire approach to teaching allowed students to explore different ideas.
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