cool cat vs heartless

cool cat

noun
  • An individual who is at ease and self-assured; one who is calm and composed in interactions with others. 

  • A person who performs or appreciates jazz, especially one whose style of speech and movement is relaxed and rhythmic. 

heartless

adj
  • Without a physical heart. 

  • Without feeling, emotion, or concern for others; uncaring. 

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