unstable
un
ˌʌn
an
sta
ˈsteɪ
stei
ble
bəl
bēl
unsuitableunsalableundatableunseeable

Definition & Meaning of "unstable"in English

unstable
01

displaying unpredictable and sudden changes in emotions and behavior 

unstable definition and meaning
Examples
His relationships were strained due to his unpredictable and unstable behavior. 
02

not firmly fixed or steady 

unstable definition and meaning
Examples
The unstable bridge swayed dangerously in the wind, making it unsafe to cross. 
03

prone to sudden change or alteration 

Grammatical Information
Composition
Compound
qualitative
Superlative
most unstable
Comparative
more unstable
gradable
Examples
The unstable weather conditions made it difficult to predict the storm’s path. 
04

(of a substance) chemically reactive or prone to rapid change when exposed to other substances 

Examples
The compound is highly unstable and must be handled with care. 
05

prone to change or failure 

Examples
The stock market has been particularly unstable lately, with frequent fluctuations in value. 
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