unfriendly vs unneighbourly

unfriendly

adj

  • Not friendly; hostile; mean. 

  • Unfavourable. 

noun

  • An enemy. 

adv

  • in an unkind or unfriendly manner; not as a friend 

unneighbourly

adj

  • Not neighbourly; antisocial. 

adv

  • In a way that is not neighbourly. 

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