The meaning of INSTABILITY is the quality or state of being unstable; especially : lack of emotional or mental stability. How to use instability in a sentence.

INSTABILITY definition: 1. uncertainty caused by the possibility of a sudden change in the present situation: 2…. Learn more.

Atmospheric instability is a major component of all weather systems on Earth. In the theory of dynamical systems, a state variable in a system is said to be unstable if it evolves without …

Instability is the quality of being unstable. ...unpopular policies, which resulted in social discontent and political instability. ...Caligula's inherent mental instability. The length of the fuselage was …

the quality or state of being likely to change or fail suddenly. a mental condition in which somebody’s behaviour is likely to change suddenly. He showed increasing signs of mental …

in•sta•bil•i•ty (ˌɪn stəˈbɪl ɪ ti) n. 1. the quality or state of being unstable; lack of stability. 2. the tendency to behave in an unpredictable or erratic manner: emotional instability.

INSTABILITY definition: the quality or state of being unstable; lack of stability or firmness. See examples of instability used in a sentence.

Sep 21, 2025 · Instability refers to a lack of stability; the state of being prone to change, fail, or fall apart. It can describe physical systems (like unstable structures or chemical elements), …

Dec 14, 2025 · (uncountable) The quality of being unstable. (physics, countable) A state that is not in equilibrium, or in which a small change has a large irreversible effect.

in•sta•bil•i•ty (in′stə bil′ i tē), n. the quality or state of being unstable; lack of stability or firmness. the tendency to behave in an unpredictable, changeable, or erratic manner: emotional instability.