indifferently vs middlingly

indifferently

adv
  • Tolerably; passably. 

  • Without distinction; impartially, objectively. 

  • Without great care; without sufficient attention or thought. 

middlingly

adv
  • In a middling manner; averagely, moderately. 

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