Definitions for: Unstable

[adj] subject to change; variable; "a fluid situation fraught with uncertainty"; "everything was unstable following the coup"
[adj] affording no ease or reassurance; "a precarious truce"
[adj] highly or violently reactive; "sensitive and highly unstable compounds"
[adj] disposed to psychological variability; "his rather unstable religious convictions"
[adj] suffering from severe mental illness; "of unsound mind"
[adj] lacking stability or fixity or firmness; "unstable political conditions"; "the tower proved to be unstable in the high wind"; "an unstable world economy"

Webster (1913) Definition: Un*sta"ble, a. [Cf. Instable.]
Not stable; not firm, fixed, or constant; subject to change
or overthrow. -- Un*sta"ble*ness, n. Chaucer.

Unstable equilibrium. See Stable equilibrium, under

Synonyms: changeable, changeful, coseismal, coseismic, crank, cranky, disturbed, explosive, fluid, insane, irresolute, labile, mentally ill, precarious, reactive, rickety, rocky, seismal, seismic, shaky, tender, thermolabile, tippy, top-heavy, tottering, uneasy, unsettled, unsound, volatile, volcanic, wobbly, wonky

Antonyms: stable

See Also: impermanent, inconstant, temporary, unsteady

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