Not compatible (with another thing); incompatible, discrepant, at odds.
Lacking internal consistency; self-contradicting; not compatible with itself.
Not consistent or coherent in thought or behavior.
Having the property that a contradiction can be derived.
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.