Longman Dictionary of Contemporary English homepage

borderline

1 adjective
     
bor‧der‧line1
1 very close to not being acceptable:
In borderline cases, the student's coursework is considered, as well as exam grades.
The referee's decision was borderline.
2 [usually before noun] having qualities of both one situation, state etc and another more extreme situation or state:
a borderline schizophrenic (=someone who has some signs of being mentally ill)
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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