Etymology
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instability (n.)

early 15c., from Old French instabilité "inconstancy" (15c.) or directly from Latin instabilitatem (nominative instabilitas) "unsteadiness," from instabilis "unsteady, not firm, inconstant, fickle," from in- "not, opposite of" (see in- (1)) + stabilis (see stable (adj.)).

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Definitions of instability

instability (n.)
an unstable order;
instability (n.)
unreliability attributable to being unstable;
instability (n.)
a lack of balance or state of disequilibrium;
Synonyms: imbalance / unbalance
instability (n.)
the quality or attribute of being unstable and irresolute;
Synonyms: unstableness
From wordnet.princeton.edu