dissatisfied vs unsatisfied

dissatisfied

adj
  • Not satisfied (e.g. with the quality of something). 

  • Feeling or displaying disappointment or a lack of contentment. 

unsatisfied

adj
  • Not satisfied, especially with the quantity of something; dissatisfied; uncontented. 

  • Not gratified; not having been fulfilled or met. 

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