Quixotic

a.
  1. Like Don Quixote; romantic to extravagance; prone to pursue unrealizable goals; absurdly chivalric; apt to be deluded. See also quixotism.
  2. Like the deeds of Don Quixote; ridiculously impractical; unachievable; extravagantly romantic; doomed to failure; as, a quixotic quest.