Not stable. / Having a strong tendency to change. / Fluctuating; not constant. / Fickle. / Unpredictable. / (chemistry) Readily decomposable. / (physics) Radioactive, especially with a short half-life.

(transitive) To release (an animal) from a stable.

Third-person singular simple present indicative form of unstable

plural of unstableness

comparative form of unstable: more unstable

Not lodged in a stable.

The quality of being unstable; instability

In an unstable manner.

plural of unstability

present participle of unstable