'Unstable equilibrium' definitions:

Definition of 'Unstable equilibrium'

From: GCIDE
  • Unstable \Un*sta"ble\, a. [Cf. Instable.] Not stable; not firm, fixed, or constant; subject to change or overthrow. -- {Un*sta"ble*ness}, n. --Chaucer. [1913 Webster]
  • Unstable equilibrium. See Stable equilibrium, under Stable. [1913 Webster]