quixotism

/kwɪkˈsɑtɪzəm/
noun
  1. The quality or practice of being quixotic; impractical idealism or noble but foolish behavior.
    • His quixotism led him to spend his entire inheritance on a failed charity project.
    • Many young activists are driven by a healthy quixotism that later matures into practical action.
    • The politician's quixotism was charming but made him ineffective in real-world negotiations.
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