Definition: The word 'antagonistical' refers to a person who is opposed or hostile towards another, often in a conflict or rivalry. The term is derived from Greek antagonia, meaning 'opposite'. It typically describes someone who opposes something or someone else, thus seeking to prevent their friend from doing so. For example, the person might be jealous of her partner's relationship with someone else, wanting him to stop seeing them romantically but not willing to compromise on personal boundaries for the sake of maintaining a harmonious relationship.