instability

 
Pronunciation: /ɪnstəˈbɪlɪti/

noun (plural instabilities)

[mass noun]
  • the state of being unstable; lack of stability: political and economic instability
  • tendency to unpredictable behaviour or erratic changes of mood: she showed increasing signs of mental instability

Origin:

late Middle English: from French instabilité, from Latin instabilitas, from instabilis, from in- 'not' + stabilis (see stable1)