Reciprocal.
Involving reflection.
That reveals or shows; revealing; indicative of.
That reflects, or redirects back to the source.
Pondering, especially thinking back on the past.
Fickle.
Readily decomposable.
Not stable.
Radioactive, especially with a short half-life.
Unpredictable.
Having a strong tendency to change.
Fluctuating; not constant.
To release (an animal) from a stable.