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Derived from "Don Quixote", a novel by the Spanish author Cervantes, quixotic refers to an individual who easily becomes wrapped up in the romance of (what they believe to be) a noble cause.   

Derived from "Don Quixote", a novel by the Spanish author Cervantes, quixotic refers to an individual who easily becomes wrapped up in the romance of (what they believe to be) a noble cause.  Example: "Young earth creationists, such as Kent Hovind and the like, tend to be overzealous, irrational, and quixotic."

Ex. Young earth creationists, such as Kent Hovind and the like, tend to be overzealous, irrational, and quixotic.