Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. having a strong tendency to change
  • adj. fluctuating; not constant
  • adj. fickle
  • adj. unpredictable
  • adj. Readily decompasable
  • adj. Radioactive, especially with a short half-life

from the GNU version of the Collaborative International Dictionary of English

  • adj. Not stable; not firm, fixed, or constant; subject to change or overthrow.

from The Century Dictionary and Cyclopedia

  • To make no longer a stable or filthy abode.
  • Not stable; not fixed.
  • Not steady; inconstant; irresolute; wavering.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. subject to change; variable
  • adj. disposed to psychological variability
  • adj. highly or violently reactive
  • adj. lacking stability or fixity or firmness
  • adj. affording no ease or reassurance
  • adj. suffering from severe mental illness

Etymologies

un- +‎ stable (Wiktionary)

Examples

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