Caught up in the romance of noble deeds and the pursuit of unreachable goals; idealistic without regard to practicality.
Capricious; impulsive: "At worst his scruples must have been quixotic, not malicious"(Louis Auchincloss).
[From English Quixote, a visionary, after Don Quixote, hero of a romance by Miguel de Cervantes.] quix·ot'i·cal·ly adv., quix'o·tism (kwĭk'sə-tĭz'əm) n.