unstable
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British pronunciation
/ʌnstˈe‍ɪbə‍l/

Definition & Meaning of "unstable"

unstable
01

displaying unpredictable and sudden changes in emotions and behavior

unstable definition and meaning
example
Example
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His relationships were strained due to his unpredictable and unstable behavior.
She struggled with an unstable temperament, often alternating between extreme joy and deep despair.
02

not firmly fixed or steady

unstable definition and meaning
example
Example
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The unstable bridge swayed dangerously in the wind, making it unsafe to cross.
The chair felt unstable, so she avoided sitting on it.
example
Example
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The unstable weather conditions made it difficult to predict the storm ’s path.
His unstable emotions caused frequent mood swings.
04

(of a substance) reacting with other chemical substances very easily

05

prone to change or failure

example
Example
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The stock market has been particularly unstable lately, with frequent fluctuations in value.
The country 's unstable political situation has caused concern among its citizens.
06

suffering from severe mental illness

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