perendinate vs shilly-shally

perendinate

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

  • To remain at college for an unusually long time. 

shilly-shally

verb
  • To procrastinate. 

  • To vacillate. 

noun
  • Indecision; irresolution. 

adj
  • Indecisive; wavering. 

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