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Webster 1913 Edition

Adj.

Not neighborly; distant; reserved; solitary; exclusive.

–

adv.

Not in a neighborly manner.

Shak.

Adj.

Not suitable to the duties of a neighbor; not becoming persons living near each other; not kind and friendly.

adv.

In a manner not suitable to a neighbor; in a manner contrary to the kindness and friendship which should subsist among neighbors.

unneighborly ‎(comparative more unneighborly, superlative most unneighborly)