sanity - definition and synonyms

noun [uncountable] 

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  1. 1
    the ability to think and speak in a reasonable way and to behave normally
    doubt your sanity (=think you may be mentally ill):

    I was beginning to doubt my own sanity.

    keep/lose your sanity (=remain/not remain in good mental health):

    Poulton knew that if he wanted to keep his sanity he would have to escape.

  2. 2
    behaviour that is reasonable or that people expect

    The manager had tried hard to bring sanity to the situation.