ruthless vs unneighbourly

ruthless

adj

  • Without pity or compassion; cruel, pitiless. 

unneighbourly

adj

  • Not neighbourly; antisocial. 

adv

  • In a way that is not neighbourly. 

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