unstable

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un·sta·ble / ˌənˈstābəl/ • adj. (-bler, -blest) prone to change, fail, or give way; not stable: the unstable cliff tops an unstable government. ∎  prone to psychiatric problems or sudden changes of mood: he was mentally unstable.DERIVATIVES: un·sta·ble·ness n.un·sta·bly / -blē/ adv.

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