ill feeling vs yuck factor

ill feeling

noun
  • A feeling of animosity or resentment. 

yuck factor

noun
  • Disgusting part of the nature of something; facet or tendencies (of a thing, idea, etc) to produce a reaction of repugnance or distaste. 

  • Recycled sewer water is opposed by many sanitation agencies due to the yuck factor. 

How often have the words ill feeling and yuck factor occurred in a corpus of books? (source: Google Ngram Viewer )