insouciant vs unneighbourly

insouciant

adj

  • Casually unconcerned; carefree, indifferent, nonchalant. 

unneighbourly

adj

  • Not neighbourly; antisocial. 

adv

  • In a way that is not neighbourly. 

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