UNSTABLE

[un.sta.ble] adj (13c): not stable: not firm or fixed: not constant: as a: not steady in action or movement: irregular "an ~ pulse" b: wavering in purpose or intent: vacillating c: lacking steadiness: apt to move, sway, or fall "an ~ tower" d (1): liable to change or alteration "an ~ economy" "~ weather" (2): readily changing (as by decomposing) in chemical composition or biological activity e: characterized by lack of emotional control syn see inconstant -- un.sta.ble.ness n -- un.sta.bly adv