quixotic

This term describes a specific brand of idealism that is romantic and noble yet completely detached from reality. It suggests a dreamer who ignores practical constraints in favor of a grand, often chivalrous, vision. While it can be used with a sense of admiration for someone's spirit, it usually carries a cautionary or slightly mocking tone regarding the likelihood of success.

In professional or political contexts, the word highlights a gap between a visionary goal and the logistical means to achieve it. It differs from simply being unrealistic by implying a certain level of romanticism or a desire to act with honor and nobility, regardless of the odds.