[ uhn-stey-buhl ]
/ ʌnˈsteɪ bəl /
not stable; not firm or firmly fixed; unsteady.
liable to fall or sway.
unsteadfast; inconstant; wavering: unstable convictions.
marked by emotional instability: an unstable person.
irregular in movement: an unstable heartbeat.
Chemistry. noting compounds that readily decompose or change into other compounds.
How Are Newly Discovered Chemical Elements Named?Unlike common elements, newer elements are synthesized in a lab; they are not observed in nature. They are very unstable and quickly dissolve into other elements. So how do scientists name them?
Related formsun·sta·ble·ness, nounun·sta·bly, adverb
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for unstably
/ (ʌnˈsteɪbəl) /
lacking stability, fixity, or firmness
disposed to temperamental, emotional, or psychological variability
(of a chemical compound) readily decomposing
- (of an elementary particle) having a very short lifetime
- spontaneously decomposing by nuclear decay; radioactivean unstable nuclide
electronics (of an electrical circuit, mechanical body, etc) having a tendency to self-oscillation
Derived Formsunstableness, noununstably, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Science definitions for unstably
[ ŭn-stā′bəl ]
Liable to undergo spontaneous decay into some other form. For example, the nucleus of uranium 238 atom is unstable and changes by radioactive decay into the nucleus of thorium 234, a lighter element. Many subatomic particles, such as muons and neutrons, are unstable and decay quickly into other particles. See more at decay.
Relating to a chemical compound that readily decomposes or changes into other compounds or into elements.
Relating to an atom or chemical element that is likely to share electrons; reactive.
Characterized by uncertain or inadequate response to treatment and the potential for unfavorable outcome, as the status of a medical condition or disease.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.