apprehensive vs calm

apprehensive

adj
  • Anticipating something with anxiety, fear, or doubt; reluctant. 

calm

adj
  • Peaceful, quiet, especially free from anger and anxiety. 

  • with few or no waves on the surface; not rippled. 

  • Free of noise and disturbance. 

  • Without wind or storm. 

noun
  • The state of being calm; peacefulness; absence of worry, anger, fear or other strong negative emotion. 

  • A period of time without wind. 

  • The state of being calm; absence of noise and disturbance. 

verb
  • To become calm. 

  • To make calm. 

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