asymmetric vs incurving

asymmetric

adj
  • Not symmetric. 

  • Of a relation R on a set S: having the property that for any two elements of S (not necessarily distinct), at least one is not related to the other via R. 

  • Not involving a mutual exchange of keys between the sender and receiver. 

incurving

adj
  • curving inwards 

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