strapping vs unstable

strapping

adj
  • Having a sturdy muscular physique; robust. 

noun
  • A beating with a strap. 

  • A length of narrow material to be used for straps, or straps collectively. 

  • The act of fastening with a strap. 

  • Adhesive plaster for strapping injuries. 

unstable

adj
  • Readily decomposable. 

  • Not stable. 

  • Radioactive, especially with a short half-life. 

  • Unpredictable. 

  • Fickle. 

  • Having a strong tendency to change. 

  • Fluctuating; not constant. 

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

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