customary vs uncustomary

customary

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

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

  • Holding or held by custom 

uncustomary

adj
  • Not customary. 

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