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
un- + stable (Wiktionary)