Unsteady, random; prone to unexpected changes; not consistent.
Deviating from normal opinions or actions; eccentric; odd.
A rock moved from one location to another, usually by a glacier.
Anything that has erratic characteristics.
Unpredictable.
Readily decomposable.
Not stable.
Radioactive, especially with a short half-life.
Fickle.
Having a strong tendency to change.
Fluctuating; not constant.
To release (an animal) from a stable.