The word 'quixotic' is inspired by Don Quixote, a character who chased unrealistic dreams. His quixotic plan to end world hunger in a year reminded people of Don Quixote's delusions.
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Unattainable Goals
'Quixotic' often describes efforts doomed to fail because the goal is unachievable. Her quixotic efforts to learn ten languages in a month were admirable but futile.
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Not Negative Always
Sometimes 'quixotic' expresses admiration for someone's bold but impractical ideas. The quixotic nature of his renewable energy project attracted many optimistic investors.