borderline

Nearly; 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.

Of questionable taste or acceptability; approaching bad taste.

• Your borderline remarks about my aunt’s dress destroyed my evening.

Exhibiting or characteristic of borderline personality disorder.

• She clearly has borderline and narcissistic features and she meets the criteria for a rapid cycling bipolar disorder, as well as for a generalized anxiety disorder. She has a severe binge eating disorder and has gained 65 pounds since[…]

Nearly; not entirely but nevertheless to a great extent.not-comparable

• He is borderline hypoglycemic and needs to monitor his sugar intake.
• I expected him to be super boring but he was actually borderline funny!

A boundary or accepted division; a border.countable

• She lives on the borderline between reality and madness.

Ellipsis of borderline personality disorder.abbreviationalt-ofellipsis

• The four overlapping concepts of borderline were as follows : (1) A residual model […] (2) An affective disorder model, which considered BPD as an affective spectrum illness displaying prominent[…]
• [...] you should consider it! People with Borderline are especially affected by the unconditional affection parenting a pet can provide.

A person who has borderline personality disorder.countable

• As an example of their affective profile, borderlines are set apart from passive aggressives by having more marked social anxiety […] and greater sensitivity […]

To border, or border on; to be physically close or conceptually akin to.transitive