Borderline

1. имя существительное граница, демаркационная линия 2. имя прилагательное пограничный; находящийся на грани в прямом и переносном значении

Большой англо-русский словарь

Borderline

I. adjective 1. a. being in an intermediate position or state ; not fully classifiable as one thing or its opposite
Example: a borderline state between waking and sleeping b. not quite up to, typical of, or as severe as what is usual, standard, or expected
Example: borderline intelligence
Example: borderline hypertension c. characterized by psychological instability in several areas (as interpersonal relations, behavior, and identity) but only with brief or no psychotic episodes
Example: a borderline personality disorder 2. situated at or near a border
Example: a borderline townborderline noun II. adverb almost, nearly
Example: borderline tacky
Example: borderline suicidal

Энциклопедический словарь Мерриама-Вебстера