curious vs customary

curious

adj
  • Containing or pertaining to trivalent curium. 

  • Tending to ask questions, or to want to explore or investigate; inquisitive; (with a negative connotation) nosy, prying. 

  • Leading one to ask questions about; somewhat odd, out of the ordinary, or unusual. 

  • Caused by curiosity. 

customary

adj
  • In accordance with, or established by, custom or common usage 

  • Holding or held by custom 

noun
  • A book containing laws and usages, or customs; a custumal. 

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