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instability

[in-stuh-bil-i-tee] /ˌɪn stəˈbɪl ɪ ti/
noun
1.
the quality or state of being unstable; lack of stability or firmness.
2.
the tendency to behave in an unpredictable, changeable, or erratic manner:
emotional instability.
Origin
late Middle English
1375-1425
1375-1425; late Middle English instabilite < Latin instabilitās. See in-3, stability
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for in-stability

instability

/ˌɪnstəˈbɪlɪtɪ/
noun (pl) -ties
1.
lack of stability or steadiness
2.
tendency to variable or unpredictable behaviour
3.
(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
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Word Origin and History for in-stability

instability

n.

early 15c., from Middle French instabilite "inconstancy," from Latin instabilitatem (nominative instabilitas) "unsteadiness," from instabilis "unsteady," from in- "not, opposite of" (see in- (1)) + stabilis (see stable (2)).

Online Etymology Dictionary, © 2010 Douglas Harper
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3
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