This is equivalent to the difference between stable and unstable equilibria. The system is chaotic and apparently unstable. She is mentally unstable and often paranoid about things. It is merciless bullying of an unstable, vulnerable woman. Difficulties thinking and emotional problems such as depression or unstable mood are also common. The culprit turned out to be a woman described as being mentally unstable. Balancing all this was a local political situation which was in danger of becoming unstable. He was reported to be terminally ill, mentally unstable, or even dead. Pinky is an extremely unstable and hyperactive mouse. Users could fuse and become stronger but more unstable. Spinodal decomposition occurs for phases that are thermodynamically unstable. Its intrinsic variability is caused by pulsations in its unstable atmosphere. This served as an indication of how unstable the situation was. A material containing unstable nuclei is considered radioactive. They are narrow, extremely unstable, and expensive.