unreliable vs unsociable

unreliable

adj

  • Not reliable. 

unsociable

adj

  • not congenial or compatible 

  • not desiring the company of others 

  • unfriendly 

noun

  • A person who is not sociable. 

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