Definitions from Wiktionary (borderline)

▸ adjective:  Nearly; not clearly on one side or the other of a border or boundary, ambiguous.
▸ adjective:  Of questionable taste or acceptability; approaching bad taste.
▸ adjective:  Exhibiting borderline personality disorder.
▸ adverb:  Nearly; not entirely but nevertheless to a great extent.
▸ noun:  (countable) A boundary or accepted division; a border.
▸ noun:  (countable) A person who has borderline personality disorder.
▸ verb:  (transitive) To border, or border on; to be physically close or conceptually akin to.
▸ noun:  (uncountable) Short for borderline personality disorder. [(psychiatry) Behavior that borders both neurosis and psychosis.]
▸ Also see borderline

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