borderline

• POS: Adjective, Noun
• HYPHEN: bor=der=line

OXFORD DICTIONARY

borderline, n. & adj.
--n.
1 the line dividing two (often extreme) conditions.
2 a line marking a boundary.
--adj.
1 on the borderline.
2 verging on an extreme condition; only just acceptable.

THESAURUS

borderline

ambiguous, bordering, boundary, bounding, coastal, determinant, determinative, determining, dubitable, equivocal, extreme, fringing, frontier, limbic, liminal, limit, limiting, littoral, marginal, open, problematic, rimming, skirting, terminal, threshold, uncertain, unclear, undecided, unsettled