instability

instability
(pl. -ies)
  1. [mass noun]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。
    ■tendency to unpredictable behaviour or erratic changes of mood
    行为无常;情绪不定
语源
  1. late Middle English: from French instabilité, from Latin instabilitas, from instabilis, from in- 'not' + stabilis (see stable)
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