heedlessly vs indifferently

heedlessly

adv
  • In a heedless manner: with unawareness; without noticing; carelessly, inattentively. 

indifferently

adv
  • Tolerably; passably. 

  • Without distinction; impartially, objectively. 

  • Without great care; without sufficient attention or thought. 

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