The Collaborative International Dictionary of English v.0.48:

Neighborly \Neigh"bor*ly\, a. [Also written neighbourly.]
   Appropriate to the relation of neighbors; having frequent or
   familiar intercourse; kind; civil; social; friendly. -- adv.
   In a neighborly manner.
   [1913 Webster]

         Judge if this be neighborly dealing.     --Arbuthnot.
   [1913 Webster]

WordNet (r) 3.0 (2006):

neighborly
    adj 1: exhibiting the qualities expected in a friendly neighbor
           [syn: neighborly, neighbourly]

Moby Thesaurus II by Grady Ward, 1.0:

47 Moby Thesaurus words for "neighborly":
   agreeable, amiable, amicable, beneficent, benevolent, benign,
   benignant, brotherly, congenial, cooperative, cordial, favorable,
   fraternal, friendlike, friendly, generous, genial, gracious,
   gregarious, harmonious, hearty, hospitable, kind, kindly,
   kindly-disposed, liberal, neighborlike, open, openhearted,
   peaceable, pleasant, propitious, receptive, simpatico, sisterly,
   sociable, social, sympathique, unhostile, warm, warmhearted,
   welcoming, well-affected, well-disposed, well-intentioned,
   well-meaning, well-meant