deteriorated vs unskilled

deteriorated

adj
  • in a state of impaired quality or value 

unskilled

adj
  • Of a made object: inexpertly made or showing a lack of skill. 

  • Of a person or workforce: not having a skill or technical training. 

  • Of a job: not requiring skill or training. 

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