faff vs perendinate

faff

verb
  • To waste time on an unproductive activity. 

noun
  • A state of confused or frantic activity. 

  • An overcomplicated task, especially one perceived as a waste of time. 

perendinate

verb
  • To procrastinate for a long time, especially two days. 

  • To remain at college for an unusually long time. 

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