Source : Webster's Revised Unabridged Dictionary (1913)

Unneighborly \Un*neigh"bor*ly\, a.
   Not neighborly; distant; reserved; solitary; exclusive. --
   adv. Not in a neighborly manner. --Shak.

Source : WordNet®

unneighborly
     adj : not exhibiting the qualities expected in a friendly neighbor
           [syn: {unneighbourly}]