indifferently vs unthinkingly

indifferently

adv
  • Without distinction; impartially, objectively. 

  • Tolerably; passably. 

  • Without great care; without sufficient attention or thought. 

unthinkingly

adv
  • In an unthinking manner. 

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