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Learn to pronounce in·sta·bil·i·ty

/ˌinstəˈbilədē/
noun
lack of stability; the state of being unstable.
"political and economic instability"
synonyms: unreliability, uncertainty, unpredictability, unpredictableness, precariousness, unsteadiness, insecurity, vulnerability, perilousness, riskiness, impermanence, temporariness, transience, inconstancy, changeability, variability, fluidity, fluctuation, rise and fall, rising and falling, chanciness, iffiness, dodginess, mutability, unsoundness, shakiness, ricketiness, wobbliness, frailty, fragility, flimsiness, insubstantiality

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: the quality or state of being unstable. especially : lack of emotional or mental stability.
noun · the quality or state of being unstable; lack of stability or firmness. · the tendency to behave in an unpredictable, changeable, or erratic manner:.
Instability is the quality of not being stable, balanced, or predictable. If you've ever walked out onto a diving board, you've probably noticed its instability ...
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the condition of being likely to change, esp. unexpectedly: Teenagers often go through periods of emotional instability.
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instability in British English · 1. lack of stability or steadiness · 2. tendency to variable or unpredictable behaviour · 3. physics.
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a mental condition in which someone's behavior is likely to change suddenly mental/emotional instability opposite stability see unstable.
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In dynamical systems instability means that some of the outputs or internal states increase with time, without bounds. ... Not all systems that are not stable are ...
n. in psychology, a tendency toward lack of self-control, erratic behavior, shifting attitudes and beliefs, and rapidly changing or excessive emotions. — ...
the tendency to behave in an unpredictable, changeable, or erratic manner: emotional instability.
unstable implies an incapacity for remaining in a fixed position or steady course and applies especially to a lack of emotional balance.