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Definition of: unstable
(un·stā′bəl) adjective
1. Lacking in stability or firmness; not stable.
2. Having no fixed purposes; easily influenced; inconstant: an unstable character.
3. Chem. Readily decomposable, as certain compounds.
4. Subject to a radical change by the application of a slight force: unstable equilibrium. See FICKLE, PRECARIOUS.
—un·sta′ble·ness noun
—un·sta′bly adverb
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