(of a person) of sound mind; not mad or mentally ill

(思考･行動からみて)〈人が〉正気の, まともな(↔ insane)

e.g. hard work kept me sane.

(of an undertaking or manner) reasonable; sensible.

〖通例名詞の前で〗分別のある, 健全な, 理にかなった〈言動･思考など〉(↔ insane)

sanely | ˈsānlē | adverb

saneness | ˈsānnis | noun

early 17th century: from Latin sanus ‘healthy’.