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un- +‎ think


unthink (third-person singular simple present unthinks, present participle unthinking, simple past and past participle unthought)

  1. (transitive, intransitive) To undo the process of thinking.
    • 1993, Henning F Harmuth, Information Theory Applied to Space-time Physics
      We should have to unthink as far back as Aristotle...
    • 2006, Kirsten Shepherd-Barr, Science on Stage: From Doctor Faustus to Copenhagen
      In An Experiment with an Air-Pump, characters repeatedly assert that "once you've thought something, you can't unthink it, can you?"

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