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WordReference Random House Learner's Dictionary of American English © 2024un•sta•ble /ʌnˈsteɪbəl/USA pronunciation adj. - not stable;
unsteady:an unstable foundation. - liable to change or fluctuate quickly;
irregular:an unstable heartbeat. - showing an inability to keep one's emotions stable or under some control:mentally unstable.
- Chemistrynoting chemical compounds that readily change into other compounds.
See -stab-. WordReference Random House Unabridged Dictionary of American English © 2024un•sta•ble (un stā′bəl),USA pronunciation adj. - 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.
- Chemistrynoting compounds that readily decompose or change into other compounds.
- 1175–1225; Middle English; see un-1, stable2
- 2.See corresponding entry in Unabridged precarious.
- 2, 3.See corresponding entry in Unabridged See unsettled.
- 3.See corresponding entry in Unabridged vacillating.
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