Unneighbourly is an adjective that describes someone who is UNFRIENDLY or hostile towards their neighbours. It is often used to describe people who are rude, inconsiderate, or unhelpful to those living nearby. Unneighbourly behaviour can range from ignoring a neighbour's request for help to engaging in physical violence. In some cases, it can even lead to legal action being taken against the perpetrator. Unneighbourly behaviour can have a negative impact on the quality of life in a neighbourhood and can lead to feelings of insecurity and mistrust among residents.