Merriam-Webster's Collegiate Dictionary
quix·ot·ic
\\kwik-ˈsä-tik\\ adjective ETYMOLOGY Don Quixote
DATE 1718
1. foolishly impractical especially in the pursuit of ideals; especially : marked by rash lofty romantic ideas or extravagantly chivalrous action2. capricious
, unpredictableSynonyms: see imaginary
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quix·ot·i·cal \\-ti-kəl\\
adjective
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quix·ot·i·cal·ly \\-ti-k(ə-)lē\\
adverb quixotic
"extravagantly chivalrous," 1791, from Don Quixote, romantic, impractical hero of Cervantes' satirical novel "Don Quixote de la Mancha" (1605). His name lit. means "thigh," also "a cuisse" (a piece of armor for the thigh), in Mod.Sp. quijote, from L. coxa "hip."
Oxford Advanced Learner's Dictionary-牛津双解-OALD7
quixoticquix·ot·ic /
kwik5sCtik;
NAmE -5sB:tik /
adjective (
formal)having or involving ideas or plans that show imagination but are usually not practical
想入非非的；异想天开的；堂吉诃德式的 ORIGIN From the character Don Quixote in the novel by Miguel de Cervantes, whose adventures are a result of him trying to achieve or obtain things that are impossible.
源自米盖尔 · 塞万提斯的作品《堂吉诃德》,其主人公堂吉诃德为了实现不切实际的理想而到处历险。
Webster's Third New International Dictionary, Unabridged
quix·ot·ic
\(ˈ)kwik|säd.]ik, -ät], ]ēk\ adjective
also quix·ot·i·cal \]ə̇kəl, ]ēk\
Etymology: quixote + -ic or -ical
: idealistic and utterly impractical; especially : marked by rash lofty romantic ideas or chivalrous action doomed to fail
< quixotic as a restoration of medieval knighthood — M.R.Cohen >