Naive
来自Big Physics
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mid 17th century: from French naïve, feminine of naïf, from Latin nativus ‘native, natural’.
wiktionary
Borrowed from French naïve, from Latin nativus(“native, natural”). Doublet of native.
etymonline
naive (adj.)
1650s, "natural, simple, unsophisticated, artless," from French naïve, fem. of naïf, from Old French naif "naive, natural, genuine; just born; foolish, innocent; unspoiled, unworked" (13c.), from Latin nativus "not artificial," also "native, rustic," literally "born, innate, natural" (see native (adj.)). In philosophy, "unreflecting, uncritical" (1895), used of non-philosophers. Related: Naively.