unneighbourly vs unprepossessed

unneighbourly

adj

  • Not neighbourly; antisocial. 

adv

  • In a way that is not neighbourly. 

unprepossessed

adj

  • Not prepossessed; unbiased 

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