Meaning of “unstable” in the English Dictionary

british dictionary

"unstable" in British English

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unstableadjective

uk /ʌnˈsteɪ.bəl/ us /ʌnˈsteɪ.bəl/

(Definition of “unstable” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"unstable" in American English

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unstableadjective

us /ʌnˈsteɪ·bəl/

not firm and therefore not strong, safe, or likely to last:

It is a poor and politically unstable country.

An unstable person suffers from sudden and extreme changes of mental state:

He’s emotionally unstable – you never know how he’ll react.

(Definition of “unstable” from the Cambridge Academic Content Dictionary © Cambridge University Press)