Unstable Definition

ŭn-stābəl
unstablest, unstabler
adjective
unstabler, unstablest
Not stable.
Webster's New World
Tending strongly to change.
Unstable weather.
American Heritage
Not constant; fluctuating.
Unstable vital signs.
American Heritage
Wavering or fickle.
At first, he was unstable in his decisions.
American Heritage
Showing or marked by erratic or volatile emotions or behavior.
American Heritage
Antonyms:
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other
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.
American Heritage Science
Relating to a chemical compound that readily decomposes or changes into other compounds or into elements.
American Heritage Science
Relating to an atom or chemical element that is likely to share electrons; reactive.
American Heritage Science
Characterized by uncertain or inadequate response to treatment and the potential for unfavorable outcome, as the status of a medical condition or disease.
American Heritage Science

Other Word Forms of Unstable

Adjective

Base Form:
unstable
Comparative:
unstabler
Superlative:
unstablest

Origin of Unstable

  • un- +"Ž stable

    From Wiktionary

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Unscrambles

unstable