Noun instability has 4 senses
  1. instability - an unstable order
    --1 is a kind of
    disorder
    Antonyms: stability
  2. instability - unreliability attributable to being unstable
    --2 is a kind of
    undependability, undependableness, unreliability, unreliableness
  3. imbalance, instability, unbalance - a state of disequilibrium (as may occur in cases of inner ear disease)
    --3 is a kind of disequilibrium
  4. instability, unstableness - the quality or attribute of being unstable and irresolute
    --4 is a kind of unsteadiness
    Antonyms: stability, stableness
    --4 has particulars: shakiness, ricketiness
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