in-stability

instability

[in-stuh-bil-i-tee]
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:
1375–1425; late Middle English instabilite < Latin instabilitās. See in-3, stability

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World English Dictionary
instability (ˌɪnstəˈbɪlɪtɪ)
 
n , 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 10th Edition
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Etymonline
Word Origin & History

instability
c.1422, from M.Fr. instabilite, from L. instabilitatem (nom. instabilitas) "unsteadiness," from instabilis "unsteady," from in- "not" + stabilis (see stable (2)).
Online Etymology Dictionary, © 2010 Douglas Harper
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