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Instable (adjective)
Exhibiting instability; unstable
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Unstable (adjective)
Having a strong tendency to change.
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Unstable (adjective)
Fluctuating; not constant.
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Unstable (adjective)
Fickle.
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Unstable (adjective)
Unpredictable.
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Unstable (adjective)
Readily decomposable.
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Unstable (adjective)
Radioactive, especially with a short half-life.
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Unstable (verb)
To release (an animal) from a stable.
Wiktionary
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Unstable (adjective)
likely to give way; not stable
“the unstable cliff tops”
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Unstable (adjective)
likely to change or fail; not firmly established
“an unstable government”
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Unstable (adjective)
prone to psychiatric problems or sudden changes of mood
“he was mentally unstable”
Oxford Dictionary