cryptozoic vs mysterious

cryptozoic

adj
  • Relating to a cryptozoite. 

  • Living in a cavity or small cave. 

  • Hidden (especially in the soil); not easily visible. 

mysterious

adj
  • Of unknown origin. 

  • Difficult to understand. 

  • Having unknown qualities. 

  • Deliberately evasive or enigmatic. 

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