The Collaborative International Dictionary of English v.0.48:
Unneighborly \Un*neigh"bor*ly\, a. Not neighborly; distant; reserved; solitary; exclusive. -- adv. Not in a neighborly manner. --Shak. [1913 Webster]WordNet (r) 3.0 (2006):
unneighborly adj 1: not exhibiting the qualities expected in a friendly neighbor [syn: unneighborly, unneighbourly]