instability

noun

1. (uncountable)The quality of being unstable.

   “The template is [Richard] Nixon’s “madman theory” of diplomatic engagement – shorthand for prompting your adversaries to doubt your sanity and mental instability to the point where they are intimidated into otherwise unlikely concessions.”

2. (countable)A state that is not in equilibrium, or in which a small change has a large irreversible effect.