fixed vs unstable

fixed

adj
  • Repaired 

  • Of sound, recorded on a permanent medium. 

  • Resolved; corrected. 

  • Surgically rendered infertile (spayed, neutered or castrated). 

  • Not changing, not able to be changed, staying the same. 

  • Attached; affixed. 

  • Chemically stable. 

  • Supplied with what one needs. 

  • Stationary. 

  • Rigged; fraudulently prearranged. 

unstable

adj
  • Fickle. 

  • Readily decomposable. 

  • Not stable. 

  • Radioactive, especially with a short half-life. 

  • Unpredictable. 

  • Having a strong tendency to change. 

  • Fluctuating; not constant. 

verb
  • To release (an animal) from a stable. 

How often have the words fixed and unstable occurred in a corpus of books? (source: Google Ngram Viewer )