indifferent vs unfavourable

indifferent

adj
  • Ambivalent; unconcerned; uninterested, apathetic. 

  • Indicating or reflecting a lack of concern or care. 

  • Having no preference. 

  • Mediocre (usually used negatively in modern usage). 

  • Not making a difference; without significance or importance. 

  • Being in the state of neutral equilibrium. 

noun
  • A person who is indifferent or apathetic. 

unfavourable

adj
  • Of a belief, state of mind, etc.: not favourable; disapproving. 

  • Of wind or weather: causing delay or obstacles; not conducive to travel or work; inclement. 

  • Serving to hinder or oppose; adverse, disadvantageous, inconducive, unsuitable. 

  • Not auspicious; ill-boding. 

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