Sanity
来自Big Physics
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late Middle English (in the sense ‘health’): from Latin sanitas ‘health’, from sanus ‘healthy’. Current senses date from the early 17th century.
wiktionary
sane + -ity, borrowed from Middle French sanité, from Latin sānitas, from sānus(“healthy”) + -itās(“-ity”). See sane, -ity
etymonline
sanity (n.)
early 15c., "healthy condition," from Old French sanité "health," from Latin sanitatem (nominative sanitas) "health, sanity," from sanus "healthy; sane" (see sane). Meaning "soundness of mind" is attested from c. 1600.
