considerate vs merciless

considerate

verb
  • Synonym of consider 

adj
  • Consciously thoughtful and observant (often of other people and their rights, needs, feelings and comfort). 

  • Characterised by careful and conscious thought. 

merciless

adj
  • Showing no mercy; cruel and pitiless. 

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