borderline

[bawr-der-lahyn]
adjective
1.
on or near a border or boundary.
2.
uncertain; indeterminate; debatable: not an alcoholic, but a borderline case.
3.
not quite meeting accepted, expected, or average standards.
4.
approaching bad taste or obscenity: He made several borderline remarks that offended them.
noun
5.
a person suffering from borderline personality.

Origin:
1865–70; border + line1


3. marginal, problematic, uncertain, doubtful.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
borderline (ˈbɔːdəˌlaɪn)
 
n
1.  a border; dividing line; line of demarcation
2.  an indeterminate position between two conditions or qualities: the borderline between friendship and love
 
adj
3.  on the edge of one category and verging on another: a borderline failure in the exam

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Etymonline
Word Origin & History

borderline
1869, "strip of land along a frontier," from border + line. As an adj. meaning "verging on" it is attested from 1907, originally in medical jargon.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But that skill can go awry in a number of psychiatric disorders, including
  autism and borderline personality disorder.
It's borderline now on the performance, and the cost is slightly above that.
In many borderline cases involving financial fraud, the crime ultimately lies
  in the eye of a beholding jury or judge.
The puppet comes to life, of course, in appalling self-pitying rants that are
  borderline funny.
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