Definition of sane adjective from the Oxford Advanced Learner's Dictionary

     

    sane

     adjective
    adjective
    BrE BrE//seɪn//
     
    ; NAmE NAmE//seɪn//
     
    (saner, sanest)
     
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  1. 1having a normal healthy mind; not mentally ill synonym sound (3) No sane person would do that. Being able to get out of the city at the weekend keeps me sane.
  2. 2sensible and reasonable the sane way to solve the problem
  3. opposite insane see also sanity
    Word Origin early 17th cent.: from Latin sanus ‘healthy’.Extra examples She seems perfectly sane to me. Being able to get out of the city at weekends keeps me sane. Having a joke and a laugh helps you stay sane. No sane person would do a thing like that.
See the Oxford Advanced American Dictionary entry: sane