Definition of instability noun from the Oxford Advanced American Dictionary

      

    instability

     noun
    noun
    NAmE//ˌɪnstəˈbɪlət̮i//
     
    [uncountable, countable, usually plural](pl. instabilities)
     
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  1. 1the quality of a situation in which things are likely to change or fail suddenly political and economic instability
  2. 2a mental condition in which someone's behavior is likely to change suddenly mental/emotional instability opposite stability see also unstable
See the Oxford Advanced Learner's Dictionary entry: instability