Quixotism

Quixotism (/kwɪkˈsɒtɪzəm/ or /kiːˈhoʊtɪzəm/; adj. quixotic) 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.

Quixotism is usually related to "over-idealism", meaning an idealism that doesn't take consequence or absurdity into account. It is also related to naïve romanticism and to utopianism.