laboured vs painful

laboured

adj
  • Expressive of strenuous effort. 

  • Of writing or speech or similar, stilted or not natural due to too much effort being used in the production. 

painful

adj
  • Requiring effort or labor; difficult, laborious. 

  • 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. 

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