self-satisfaction vs slackness

self-satisfaction

noun
  • The state of being excessively pleased with oneself; smugness. 

  • A feeling of fulfillment or contentment with respect to one's own accomplishments or situation. 

slackness

noun
  • The state of being slack; the quality of having slack. 

  • A subgenre of dancehall music with sexual lyrics. 

  • Vulgarity in West Indian culture. 

How often have the words self-satisfaction and slackness occurred in a corpus of books? (source: Google Ngram Viewer )