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borderline personality disorder
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borderline

bor·der·line [ báwrdər ln ]


noun  (plural bor·der·lines)
Definition:
 
separating line: the notional line that separates one state or quality from another very similar one
the borderline between frankness and rudeness



adjective 
Definition:
 
1. at category's edge: not clearly belonging to one or other of two categories
Borderline applicants will be reconsidered.

2. psychology psychologically unstable: describes a psychological condition characterized by emotional instability and marked by self-destructive, manipulative, and erratic behavior
a borderline schizophrenic

3. medicine almost developed: describes a medical condition that a patient is likely to develop unless preventive steps are taken
borderline hypertension

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