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.
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