borderline
//ˈbɔːdəlaɪn//
Adjective
borderlineCanonical form
1
Only just acceptable in quality or as belonging to a category; on the edge between two conditions or states.
His test score was borderline, so the teacher gave him another chance.
2
Relating to or denoting a personality disorder characterized by instability of mood and behavior.
She was diagnosed with borderline personality disorder.
Noun
borderlineSingular
borderlinesPlural
1
A boundary or dividing line separating two areas, conditions, or categories.
The borderline between work and personal life is becoming increasingly blurred.