Alienation means feeling disconnected or isolated from others. It is when you feel like you don't belong or aren't understood by the people around you, which can make you feel lonely or left out. Full definition
Don't you think it's a little odd that the same advocates of the legal defense theory of parental alienation syndrome also are joint custody advocates? (thelizlibrary.org)
In parental alienation in separated families we are talking about children (or young adults) being harmed. (thealienationexperience.org.uk)