Definition of stable adjective from the Oxford Advanced American Dictionary

        

    stable

     adjective
    adjective
    NAmE//ˈsteɪbl//
     
     
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  1. 1firmly fixed; not likely to move, change, or fail synonym steady stable prices a stable relationship This ladder doesn't seem very stable. The patient's condition is stable (= it is not getting worse). The situation in the country has remained relatively stable for a few months now.
  2. 2(of a person) calm and reasonable; not easily upset synonym balanced Mentally, she is not very stable.
  3. 3(technology) (of a substance) staying in the same chemical or atomic state chemically stable an element forming stable compounds opposite unstable
  4. NAmE//ˈsteɪbli//
     
    adverb
  5. Word Familystable adjective (unstable)stability noun (instability)stabilize verb
See the Oxford Advanced Learner's Dictionary entry: stable