not stable; not firm, fixed, or constant
unsteady or irregular
apt to move, sway, or fall; not firmly fixed
unsteady or irregular
characterized by or given to sudden changes of mood or an inability to control the emotions
readily changing in chemical composition or physical properties
unstable compounds
an unstable emulsion
said of an atom or atomic particle: existing only for a short time
said of an atom or chemical element: undergoing spontaneous radioactive decay or decomposition
unstableness noun
unstably adv