sluggishness vs velocity

sluggishness

noun
  • The state of economic decline, inactivity, slow or subnormal growth. 

  • The property of being sluggish, unable or unwilling to act quickly. 

velocity

noun
  • A vector quantity that denotes the rate of change of position with respect to time, combining speed with a directional component. 

  • The number of times that an average unit of currency is spent during a specific period of time. 

  • Rapidity of motion. 

  • The rate of occurrence. 

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