madcap vs whackjob

madcap

noun

  • An impulsive, hasty, capricious person. 

adj

  • Hasty, impulsive, or reckless; capricious. 

whackjob

noun

  • A crazy, possibly dangerous, person. 

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