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 Stable.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.