noun
a person who is idealistic in an impractical way
adjective
exceedingly idealistic; unrealistic and impractical
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The politician's quixotic proposal to eliminate all taxes was met with skepticism by economists.
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I know it's quixotic, but I still believe I can win the lottery one day.
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His plan to become a famous actor overnight is just plain quixotic.
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Her quixotic quest for the perfect relationship led her on a wild journey of self-discovery.