agonizing vs grievous

agonizing

adj

  • Causing physical or mental agony. 

noun

  • The act of one who agonizes. 

grievous

adj

  • Causing grief, pain, or sorrow. 

  • Serious, grave, dire, or dangerous. 

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