instability
/ˌɪnstəˈbɪlətɪ/noun
(pl. -ies)［mass noun］
1- lack of stability; the state of being unstable不稳定, 不稳固：
political and economic instability.
政治和经济的不稳定。
1.1
- tendency to unpredictable behaviour or erratic changes of mood行为无常; 情绪不定。
词源
late Middle English: from French instabilité, from Latin instabilitas, from instabilis, from in- 'not' + stabilis （see STABLE1）.