Quixotism

Quixotism (/kwɪkˈsɒtɪzəm/ or /kiːˈhoʊtɪzəm/) is impracticality in pursuit of ideals, especially those ideals manifested by rash, lofty and romantic ideas or extravagantly chivalrous action. It also serves to describe an idealism without regard to practicality. An impulsive person or act might be regarded as quixotic.