ideological vs iffy

ideological

adj
  • Of or pertaining to an ideology. 

  • Based on an ideology or misleading studies or statistics, especially based on the media or propaganda. Not based on scientific evidence or reality. 

iffy

adj
  • Of dubious authenticity, legitimacy or legality. 

  • Uncertain or chancy. 

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