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Synonyms
un·sta·ble (ŭn-stā́bəl)

adjective: -bler, -blest. 

    1. Tending strongly to change: unstable weather.
    2. Not constant; fluctuating: unstable vital signs.
    1. Fickle.
    2. Lacking control of one's emotions; marked by unpredictable behavior.
  3. Not firmly placed; unsteady: an unstable ladder.
  4. Chemistry
    1. Decomposing readily.
    2. Highly or violently reactive.
  5. Physics
    1. Decaying with relatively short lifetime. Used of subatomic particles.
    2. Radioactive.

derivatives

un·stáble·ness
noun
un·stábly
adverb