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unstable  adj 
1 lacking stability, fixity, or firmness 
2 disposed to temperamental, emotional, or psychological variability 
3 (of a chemical compound) readily decomposing 
4  (Physics) 
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