sane 
/ˈseɪn/ adjective
san·er; san·est /ˈseɪn/ adjective [also more sane; most sane] 1 : having a healthy mind : able to think normally
▪ He is perfectly sane. [=he is not mentally ill] ▪ No sane person could do something so horrible. ▪ Trips to the beach keep me sane. [=keep me feeling happy and able to deal with life without becoming too upset, nervous, etc.] ▪ It's hard to stay/remain sane [=to stay relaxed, calm, etc.] when I'm so busy. — opposite insane 2 : based on reason or good judgment : rational or sensible
▪ Leaving was the only sane option she had. ▪ a sane policy/decision
▪ He is perfectly sane. [=he is not mentally ill] ▪ No sane person could do something so horrible. ▪ Trips to the beach keep me sane. [=keep me feeling happy and able to deal with life without becoming too upset, nervous, etc.] ▪ It's hard to stay/remain sane [=to stay relaxed, calm, etc.] when I'm so busy. — opposite insane
▪ Leaving was the only sane option she had. ▪ a sane policy/decision
— sane·ly adverb
▪ He spoke sanely.
▪ He spoke sanely.
