unstable adj
1 lacking stability, fixity, or firmness
2 disposed to temperamental, emotional, or psychological variability
3 (of a chemical compound) readily decomposing
a (of an elementary particle) having a very short lifetime
b spontaneously decomposing by nuclear decay; radioactive
an unstable nuclide
5 (Electronics) (of an electrical circuit, mechanical body, etc.) having a tendency to self-oscillation
♦
unstableness n
♦
unstably adv