ear to the ground vs insightful

ear to the ground

noun
  • The practice or characteristic of carefully gathering information; a state or mindset of attentiveness. 

  • Pursuing the practice or having the characteristic of carefully gathering information; well-informed. 

insightful

adj
  • Possessing insight. 

How often have the words ear to the ground and insightful occurred in a corpus of books? (source: Google Ngram Viewer )