castoff vs outdated

castoff

adj
  • discarded, rejected. 

noun
  • Something that has been rejected or discarded; a reject. 

outdated

adj
  • Out of date; not the latest; obsolete. 

  • Out of date, old-fashioned, antiquated. 

How often have the words castoff and outdated occurred in a corpus of books?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