desirable vs unattractive

desirable

noun
  • A thing that people want; something that is desirable. 

adj
  • Worthy to be desired; pleasing; agreeable. 

unattractive

adj
  • Not handsome or beautiful or appealing. 

  • Lacking the power to attract interest. 

noun
  • An aesthetically unattractive person 

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