The word "unneighborly" means not friendly or helpful towards one's neighbors. Antonyms for this word would be words that describe a friendly neighborly behavior. Some possible antonyms include cordial, cheerful, warm, welcoming, sociable, hospitable, kind, courteous, and considerate. A cordial neighbor is one who is friendly and polite, while a cheerful neighbor is always in a good mood and spreads positivity. A warm neighbor is someone who shows kindness and generosity to their neighbors, while a hospitable neighbor is someone who makes their home open and welcoming to visitors. A sociable neighbor enjoys spending time with others and is easy to talk to, while a considerate neighbor is thoughtful and considerate of the feelings of others.