Quixotic
/kwɪkˈsɑːtɪk/ adjective hardPursuing an idealistic, impractical goal with little regard for whether it can actually be achieved.
His quixotic plan to end world hunger with a single fundraiser was admirable but unrealistic.
Memory Trick
Named after Don Quixote, the novel's hero who charged at windmills believing they were giants — a quixotic dream chases equally impossible targets.