castoff vs forgetfulness

castoff

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

adj
  • discarded, rejected. 

forgetfulness

noun
  • Failure to bear in mind; careless omission; inattention. 

  • Loss of remembrance or recollection; a ceasing to remember; oblivion. 

  • The quality of being forgetful; proneness to let slip from the mind. 

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