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unstable Twit Definition of unstable Share Definition of unstable on Facebook Digg:Definition of unstable! stumble Definition of unstable Bookmark Definition of unstable on Delicious submit Definition of unstable to reddit Bookmark Definition of unstable
adjective 
  1. Having a strong tendency to change
  2. fluctuate, Fluctuating; not constant
  3. fickle
  4. unpredictable
  5. (chemistry) Readily decompose, decompasable
  6. (physics) radioactive, Radioactive, especially with a short half-life
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