marginal

adjective

1. 1

   at or constituting a border or edge

   the marginal strip of beach

2. 2

   of questionable or minimal quality

   borderline grades

   marginal writing ability

3. 3

   producing at a rate that barely covers production costs

   marginal industries

4. 4

   just barely adequate or within a lower limit

   a bare majority

   a marginal victory