oppugnant vs unneighbourly

oppugnant

adj

  • opposing, antagonistic, contrary 

unneighbourly

adj

  • Not neighbourly; antisocial. 

adv

  • In a way that is not neighbourly. 

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