Neighborly

wiktionary

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neighbor +‎  -ly

etymonline

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neighborly (adj.)

1550s, "kindly, considerate, becoming a neighbor," from neighbor (n.) + -ly (1). Earlier as an adverb (1520s), while an earlier adjective form was neighborlike (late 15c.). Of persons, "cultivating familiar intercourse," 1610s. Related: Neighborliness, which ousted earlier neighborship (mid-15c.).