foolishness vs imbecility

foolishness

noun
  • A thing or event that is foolish, or an absurdity. 

  • The state of being foolish. 

imbecility

noun
  • Something imbecilic; a stupid action, behaviour, etc. 

  • The quality of being imbecile; weakness; feebleness, especially of mind. 

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