phlegmatic vs volatile

phlegmatic

adj
  • Not easily excited to action or passion; calm; sluggish. 

  • Generating, causing, or full of phlegm. 

noun
  • One who has a phlegmatic disposition. 

volatile

adj
  • Quick to become angry or violent. 

  • Explosive. 

  • Temporary or ephemeral. 

  • Variable or erratic. 

  • Fickle. 

  • Whose content is lost when the computer is powered down 

  • Having its associated memory immediately updated with any changes in value. 

  • Potentially violent. 

  • Evaporating or vaporizing readily under normal conditions. 

noun
  • A variable that is volatile, i.e. has its associated memory immediately updated with any change in value. 

  • A chemical or compound that changes into a gas easily. 

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