astrological vs inscrutable

astrological

adj
  • Of, or relating to astrology. 

inscrutable

noun
  • One who or that which is inscrutable; a person, etc. that cannot be comprehended. 

adj
  • Difficult or impossible to comprehend, fathom, or interpret. 

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