repellent vs unattractive

repellent

noun
  • Someone who repels. 

  • A substance used to repel insects, other pests, or dangerous animals. 

  • A substance or treatment for a fabric etc to make it impervious to something. 

adj
  • Repulsive, inspiring aversion. 

  • Resistant or impervious to something. 

  • Tending or able to repel; driving back. 

unattractive

noun
  • An aesthetically unattractive person 

adj
  • Not handsome or beautiful or appealing. 

  • Lacking the power to attract interest. 

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