ignorance vs thoughtlessness

ignorance

noun
  • Sins committed through ignorance. 

  • The condition of being uninformed or uneducated; lack of knowledge or information. 

thoughtlessness

noun
  • heedless disregard for the consequences of one's actions 

  • disregard for other's feelings 

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