reflection vs thoughtfulness

reflection

noun
  • Careful thought or consideration. 

  • The act of reflecting or the state of being reflected. 

  • The process or mechanism of determining the capabilities of an object at run-time. 

  • The folding of a part; a fold. 

  • Something, such as an image, that is reflected. 

  • The property of a propagated wave being thrown back from a surface (such as a mirror). 

  • An implied criticism. 

thoughtfulness

noun
  • Thoughtful and considerate attention. 

  • Careful deliberation before action. 

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