not easy vs painful

not easy

painful

adj
  • Afflicted or suffering with pain (of a body part or, formerly, of a person). 

  • Very bad, poor. 

  • Causing pain or distress, either physical or mental. 

  • Requiring effort or labor; difficult, laborious. 

How often have the words not easy and painful occurred in a corpus of books? (source: Google Ngram Viewer )