borderline

from WordNet (r) 3.0 (2006)

borderline
    adj 1: of questionable or minimal quality; "borderline grades";
           "marginal writing ability" [syn: {borderline},
           {marginal}]
    n 1: a line that indicates a boundary [syn: {boundary line},
         {border}, {borderline}, {delimitation}, {mete}]

from Moby Thesaurus II by Grady Ward, 1.0

29 Moby Thesaurus words for "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

[email protected]