noun (n)

• an unstable order(noun.state)

  Antonym:
  stability
  

  source: wordnet30
• unreliability attributable to being unstable(noun.attribute)

  source: wordnet30
• a lack of balance or state of disequilibrium(noun.state)

  Synonym:
  imbalance, unbalance
  Antonym:
  balance
  

  source: wordnet30
• the quality or attribute of being unstable and irresolute(noun.attribute)

  Synonym:
  unstableness
  Antonym:
  stability, stableness
  

  source: wordnet30
• The quality or condition of being unstable; want of stability, firmness, or steadiness; liability to give way or to fail; insecurity; precariousness; as, the instability of a building.(noun)

  source: webster1913