befilth vs filthy

befilth

verb
  • To cover with filth; make filthy; begrime. 

filthy

verb
  • To cover in filth. 

  • To make very dirty; to saturate something with dirt. 

adj
  • Covered with filth; very dirty. 

  • Obscene or offensive. 

  • Very unpleasant or disagreeable. 

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