instability

[ in-stuh-bil-i-tee ]
/ ˌɪn stəˈbɪl ɪ ti /

noun

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.

Origin of instability

1375–1425; late Middle English instabilite < Latin instabilitās. See in-3, stability
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Examples from the Web for instability

British Dictionary definitions for instability

instability

/ (ˌɪnstəˈbɪlɪtɪ) /

noun plural -ties

lack of stability or steadiness
tendency to variable or unpredictable behaviour
physics a fast growing disturbance or wave in a plasma
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012