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English definition of “unstable”

unstable

adjective     /ʌnˈsteɪbl/
CHANGE likely to change or end suddenly: an unstable situation an unstable economyChangingAdapting and modifying Adapting and attuning to somethingChanging frequently
PERSON If someone is unstable, their moods and behaviour change suddenly, especially because they are mentally ill.Mental and psychiatric disorders
MOVE not fixed or safe and likely to move: That chair looks a bit unstable.Fragile and breakable
(Definition of unstable adjective from the Cambridge Learner's Dictionary © Cambridge University Press)

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