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English definition of “unstable”

unstable

adjective     /ʌnˈsteɪ.bl̩/
not solid and firm and therefore not strong , safe , or likely to last: That chair looks a bit unstable to me. It is a poor and politically unstable society .Unsafe and insecure describes someone who suffers from sudden and extreme changes in their mental and emotional state : emotionally unstableOf unsound mindStupid and silly
(Definition of unstable adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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