Definitions
1.AdjectiveNearly; not clearly on one side or the other of a border or boundary, ambiguous."I would rather hire a talented layman than a university graduate with borderline qualifications."
2.AdjectiveOf questionable taste or acceptability; approaching bad taste."Your borderline remarks about my aunt’s dress destroyed my evening."
3.AdjectiveExhibiting borderline personality disorder.
4.AdverbNearly; not entirely but nevertheless to a great extent."He is borderline hypoglycemic and needs to monitor his sugar intake.; I expected him to be super boring but he was actually borderline funny!"
5.NounA boundary or accepted division; a border."She lives on the borderline between reality and madness."
6.NounEllipsis of borderline personality disorder.
7.NounA person who has borderline personality disorder.
8.VerbTo border, or border on; to be physically close or conceptually akin to.