mouldy vs unworthy

mouldy

adj
  • Worthless; lousy; rotten. 

  • Covered with mould. 

  • Showing signs of neglect; disused. 

unworthy

adj
  • Not worthy; lacking value or merit; worthless. 

noun
  • An inadequate person. 

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