pejorate vs uglify

pejorate

verb
  • To make or become worse; to deteriorate or to worsen. 

uglify

verb
  • To make ugly; to destroy or worsen the appearance or attractiveness of. 

  • Synonym of minify 

  • To become ugly. 

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