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Adelung-1793: Naiv
Brockhaus-1809: Naïv (zweisilbig)
Brockhaus-1911: Naiv
Eisler-1904: Naiv
Herder-1854: Naiv
Kirchner-Michaelis-1907: naiv
Meyers-1905: Naiv
Pierer-1857: Naīv
Sulzer-1771: Naiv