abrasively vs mercilessly

abrasively

adv
  • Hardly; roughly; in a rough manner. 

  • In an abrasive manner; in a rude and unkind manner; acting in a way that may hurt other people's feelings. 

mercilessly

adv
  • In a merciless manner. 

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