circumspection vs thoughtlessness

circumspection

noun
  • Caution, watchfulness, or vigilance fueled by such awareness. 

  • Attention to all the facts and circumstances of a case; consideration of all that is pertinent. 

thoughtlessness

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

  • disregard for other's feelings 

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