reflective vs thoughtless

reflective

adj
  • Involving reflection. 

  • Reciprocal. 

  • That reveals or shows; revealing; indicative of. 

  • That reflects, or redirects back to the source. 

  • Pondering, especially thinking back on the past. 

thoughtless

adj
  • Lacking thought or consideration. 

  • Marked by or showing lack of due thought or care; careless. 

  • Inconsiderate, inattentive. 

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