QUIXOTIC

quix·ot·ic (kwik-SAH-tik) also quix·ot·i·cal (--kl) adj.
  1. Caught up in the romance of noble deeds and the pursuit of unreachable goals; idealistic without regard to practicality.
  2. 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·oti·cal·ly adv. quixo·tism (kwks-tzm) n.

Source: The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2000 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

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