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1. An unstable order
    
2. Unreliability attributable to being unstable
    
3. A lack of balance or state of disequilibrium
   "a hormonal instability"
   - imbalance, unbalance
    
4. The quality or attribute of being unstable and irresolute
   - unstableness

Derived forms: instabilities

Type of: disequilibrium, disorder, undependability, undependableness, unreliability, unreliableness, unsteadiness

Antonym: stability

Encyclopedia: Instability