beautify vs impair

beautify

verb
  • Synonym of pretty-print 

  • To make oneself beautiful. 

  • To become beautiful. 

  • To make beautiful; to increase the beauty of. 

impair

verb
  • To weaken; to affect negatively; to have a diminishing effect on. 

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