sanity (n.)youdaoicibaDictYouDict[sanity 词源字典]
early 15c., "healthy condition," from Middle French sanité "health," from Latin sanitatem (nominative sanitas) "health, sanity," from sanus "healthy; sane" (see sane). Meaning "soundness of mind" first attested c. 1600.[sanity etymology, sanity origin, 英语词源]