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Meaning of unstable

un•sta•ble

Pronunciation: (un-stā'bul), [key]
— adj.
  1. not stable; not firm or firmly fixed; unsteady.
  2. liable to fall or sway.
  3. unsteadfast; inconstant; wavering: unstable convictions.
  4. marked by emotional instability: an unstable person.
  5. irregular in movement: an unstable heartbeat.
  6. noting compounds that readily decompose or change into other compounds.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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