thrive vs weaken

thrive

verb
  • To grow or increase stature; to grow vigorously or luxuriantly, to flourish. 

  • To increase in wealth or success; to prosper, be profitable. 

weaken

verb
  • To become weaker or less strong. 

  • To make weaker or less strong. 

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