brutally vs hardheartedly

brutally

adv
  • In a brutal manner; viciously, barbarically. 

  • Extremely. 

  • In a direct way that does not attempt to hide, disguise or mask unpleasantness; directly. 

hardheartedly

adv
  • In a hardhearted manner. 

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