lost in thought vs reflective

lost in thought

adj
  • Being preoccupied with one's thoughts rather than paying attention to reality. 

reflective

adj
  • Pondering, especially thinking back on the past. 

  • Involving reflection. 

  • Reciprocal. 

  • That reveals or shows; revealing; indicative of. 

  • That reflects, or redirects back to the source. 

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