impoverished vs poor as a church mouse

impoverished

adj
  • Reduced to poverty. 

  • Having lost a component, an ingredient, or a faculty or a feature; rendered poor in something; depleted. 

poor as a church mouse

adj
  • Very poor, to the point of starving or begging; utterly destitute. 

How often have the words impoverished and poor as a church mouse occurred in a corpus of books? (source: Google Ngram Viewer )